diff --git a/_build/tools/functions/parse-version.sh.inc b/_build/tools/functions/parse-version.sh.inc
deleted file mode 100644
index 1b6dcce..0000000
--- a/_build/tools/functions/parse-version.sh.inc
+++ /dev/null
@@ -1,44 +0,0 @@
-##
-# Evaluates a version string
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-parse_version() {
-    VERSION_FULL="$1"
-
-    if [ "${VERSION_FULL:0:1}" == "v" ]; then
-        VERSION_FULL="${VERSION_FULL:1}"
-    fi
-
-    if [[ "$VERSION_FULL" =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)(-([0-9A-Za-z\.\-]+))?(\+([0-9A-Za-z\.\-]+))?$ ]]; then
-        VERSION_MAJOR="${BASH_REMATCH[1]}"
-        VERSION_MINOR="${BASH_REMATCH[2]}"
-        VERSION_PATCH="${BASH_REMATCH[3]}"
-        VERSION_SUFFIX="${BASH_REMATCH[5]}"
-        VERSION_BUILD="${BASH_REMATCH[7]}"
-
-        VERSION_STABILITY="stable"
-        if [[ "$VERSION_SUFFIX" =~ ^(dev|a|alpha|b|beta|RC)?([.-]?[0-9]+)?([.-](dev))?$ ]]; then
-            if [ "${BASH_REMATCH[1]}" == "dev" ] || [ "${BASH_REMATCH[4]}" == "dev" ]; then
-                VERSION_STABILITY="dev"
-            elif [ "${BASH_REMATCH[1]}" == "a" ] || [ "${BASH_REMATCH[1]}" == "alpha" ]; then
-                VERSION_STABILITY="alpha"
-            elif [ "${BASH_REMATCH[1]}" == "b" ] || [ "${BASH_REMATCH[1]}" == "beta" ]; then
-                VERSION_STABILITY="beta"
-            elif [ "${BASH_REMATCH[1]}" == "RC" ]; then
-                VERSION_STABILITY="RC"
-            fi
-        fi
-
-        VERSION_MILESTONE="$VERSION_MAJOR.$VERSION_MINOR"
-        VERSION_NAME="$VERSION_MAJOR.$VERSION_MINOR.$VERSION_PATCH"
-        VERSION_ID="$VERSION_MAJOR$(printf '%02d' "$VERSION_MINOR")$(printf '%02d' "$VERSION_PATCH")"
-
-        return 0
-    else
-        return 1
-    fi
-}
diff --git a/_build/tools/generate-badge.sh b/_build/tools/generate-badge.sh
deleted file mode 100755
index 5727e74..0000000
--- a/_build/tools/generate-badge.sh
+++ /dev/null
@@ -1,55 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Downloads a custom badge from shields.io
-#
-# All credit goes to the awesome guys at shields.io!
-#
-# @see     http://shields.io/
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# parameters
-BADGE_FILE_PATH="$1"    # target file path
-BADGE_SUBJECT="$2"      # subject (left half) of the badge
-BADGE_STATUS="$3"       # status (right half) of the badge
-BADGE_COLOR="$4"        # color of the badge
-
-# print parameters
-echo "Generating badge..."
-printf 'BADGE_FILE_PATH="%s"\n' "$BADGE_FILE_PATH"
-printf 'BADGE_SUBJECT="%s"\n' "$BADGE_SUBJECT"
-printf 'BADGE_STATUS="%s"\n' "$BADGE_STATUS"
-printf 'BADGE_COLOR="%s"\n' "$BADGE_COLOR"
-echo
-
-# download badge from shields.io
-printf 'Downloading badge...\n'
-TMP_BADGE="$(mktemp -u)"
-
-curl --location --output "$TMP_BADGE" \
-    "https://img.shields.io/badge/$BADGE_SUBJECT-$BADGE_STATUS-$BADGE_COLOR.svg"
-
-# validate badge
-if [ ! -f "$TMP_BADGE" ] || [ ! -s "$TMP_BADGE" ]; then
-    echo "Unable to generate badge; skipping..." >&2
-    exit 1
-fi
-
-# MIME type image/svg+xml isn't supported at the moment
-#
-#TMP_BADGE_MIME="$(file --mime-type "$TMP_BADGE" | cut -d ' ' -f 2)"
-#if [ "$TMP_BADGE_MIME" != "image/svg+xml" ]; then
-#    echo "Generated badge should be of type 'image/svg+xml', '$TMP_BADGE_MIME' given; aborting...\n" >&2
-#    exit 1
-#fi
-
-# deploy badge
-mv "$TMP_BADGE" "$BADGE_FILE_PATH"
-
-echo
diff --git a/_build/tools/generate-phpdoc.sh b/_build/tools/generate-phpdoc.sh
deleted file mode 100755
index f22432a..0000000
--- a/_build/tools/generate-phpdoc.sh
+++ /dev/null
@@ -1,57 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Generates phpDoc class documentation
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# parameters
-PHPDOC_CONFIG="$1"          # phpDoc config file
-PHPDOC_CACHE_DIR="$2"       # phpDoc cache dir
-PHPDOC_TARGET_DIR="$3"      # phpDoc output dir
-PHPDOC_TITLE="$4"           # API docs title
-
-# print parameters
-echo "Generating phpDocs..."
-printf 'PHPDOC_CONFIG="%s"\n' "$PHPDOC_CONFIG"
-printf 'PHPDOC_CACHE_DIR="%s"\n' "$PHPDOC_CACHE_DIR"
-printf 'PHPDOC_TARGET_DIR="%s"\n' "$PHPDOC_TARGET_DIR"
-printf 'PHPDOC_TITLE="%s"\n' "$PHPDOC_TITLE"
-echo
-
-# update a separate phpDoc cache
-if [ "$PHPDOC_CACHE_DIR" != "-" ]; then
-    # parse phpDoc files (i.e. update cache)
-    printf "Update phpDoc cache...\n"
-    phpdoc project:parse --config "$PHPDOC_CONFIG" \
-        --target "$PHPDOC_CACHE_DIR"
-
-    # check for changes
-    printf '\nCheck for phpDoc cache changes...\n'
-    if [ -z "$(git status --porcelain "$PHPDOC_CACHE_DIR")" ]; then
-        printf 'No changes detected; skipping phpDocs renewal...\n\n'
-        exit 0
-    fi
-
-    # NOTE: actually the following command should be `phpdoc project:transform`
-    #       instead of `phpdoc project:run`, but the command seems to be broken...
-    echo
-else
-    # create temporary cache files in PHPDOC_TARGET_DIR
-    PHPDOC_CACHE_DIR="$PHPDOC_TARGET_DIR"
-fi
-
-# transform phpDoc files (i.e. rewrite API docs)
-printf 'Rewrite phpDocs...\n'
-rm -rf "$PHPDOC_TARGET_DIR"
-phpdoc project:run --config "$PHPDOC_CONFIG" \
-    --cache-folder "$PHPDOC_CACHE_DIR" \
-    --target "$PHPDOC_TARGET_DIR" \
-    --title "$PHPDOC_TITLE"
-
-echo
diff --git a/_build/tools/github-clone.sh b/_build/tools/github-clone.sh
deleted file mode 100755
index e8cb1de..0000000
--- a/_build/tools/github-clone.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Clones a Git repo
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# parameters
-CLONE_TARGET_DIR="$1"   # target directory
-CLONE_REPO_URL="$2"     # URL of the git repo to clone
-CLONE_REPO_BRANCH="$3"  # optional branch to checkout
-
-# print parameters
-echo "Cloning repo..."
-printf 'CLONE_TARGET_DIR="%s"\n' "$CLONE_TARGET_DIR"
-printf 'CLONE_REPO_URL="%s"\n' "$CLONE_REPO_URL"
-printf 'CLONE_REPO_BRANCH="%s"\n' "$CLONE_REPO_BRANCH"
-echo
-
-# clone repo
-[ -n "$CLONE_REPO_BRANCH" ] || CLONE_REPO_BRANCH="master"
-git clone --branch="$CLONE_REPO_BRANCH" "$CLONE_REPO_URL" "$CLONE_TARGET_DIR"
-
-echo
diff --git a/_build/tools/github-commit.sh b/_build/tools/github-commit.sh
deleted file mode 100755
index 6521160..0000000
--- a/_build/tools/github-commit.sh
+++ /dev/null
@@ -1,45 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Commits changes to a Git repo
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# parameters
-COMMIT_MESSAGE="$1"     # commit message
-shift 1
-
-# print parameters
-echo "Commiting changes..."
-printf 'COMMIT_MESSAGE="%s"\n' "$COMMIT_MESSAGE"
-echo
-
-# stage changes
-COMMIT_FILES=()
-while [ $# -gt 0 ]; do
-    if [ -n "$(git status --porcelain "$1")" ]; then
-        if [ -d "$1" ]; then
-            git add --all "$1"
-        elif [ -f "$1" ] || [ -h "$1" ]; then
-            git add "$1"
-        else
-            echo "Unable to commit '$1': No such file, symbolic link or directory" >&2
-            exit 1
-        fi
-
-        COMMIT_FILES+=( "$1" )
-        shift
-    fi
-done
-
-# commit changes
-if [ ${#COMMIT_FILES[@]} -gt 0 ]; then
-    git commit --message="$COMMIT_MESSAGE" "${COMMIT_FILES[@]}"
-fi
-
-echo
diff --git a/_build/tools/github-deploy.sh b/_build/tools/github-deploy.sh
deleted file mode 100755
index b7ec649..0000000
--- a/_build/tools/github-deploy.sh
+++ /dev/null
@@ -1,73 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Pushes commits to a GitHub repo
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# parameters
-CHECK_REPO_SLUG="$1"        # optional GitHub repo (e.g. picocms/Pico) to check
-                            # its latest commit as basic race condition protection
-CHECK_REMOTE_REF="$2"       # optional remote Git reference (e.g. heads/master)
-CHECK_LOCAL_COMMIT="$3"     # optional local commit SHA1
-
-# environment variables
-# GITHUB_OAUTH_TOKEN    GitHub authentication token, see https://github.com/settings/tokens
-
-# print parameters
-echo "Deploying repo..."
-printf 'CHECK_REPO_SLUG="%s"\n' "$CHECK_REPO_SLUG"
-printf 'CHECK_REMOTE_REF="%s"\n' "$CHECK_REMOTE_REF"
-printf 'CHECK_LOCAL_COMMIT="%s"\n' "$CHECK_LOCAL_COMMIT"
-echo
-
-# check for changes
-if [ -z "$(git log --oneline '@{upstream}..')" ]; then
-    printf 'Nothing to deploy; skipping...\n\n'
-    exit 0
-fi
-
-# race condition protection for concurrent Travis builds
-# this is no definite protection (race conditions are still possible during `git push`),
-# but it should give a basic protection without disabling concurrent builds completely
-if [ -n "$CHECK_REPO_SLUG" ] && [ -n "$CHECK_REMOTE_REF" ] && [ -n "$CHECK_LOCAL_COMMIT" ]; then
-    # retrieve information using GitHub APIv3
-    echo "Checking latest commit$([ -n "$GITHUB_OAUTH_TOKEN" ] && echo " (authorized)")..."
-    CHECK_API_URL="https://api.github.com/repos/$CHECK_REPO_SLUG/git/refs/$CHECK_REMOTE_REF"
-    if [ -n "$GITHUB_OAUTH_TOKEN" ]; then
-        CHECK_API_RESPONSE="$(curl --fail --silent --show-error --header "Authorization: token $GITHUB_OAUTH_TOKEN" "$CHECK_API_URL")"
-    else
-        CHECK_API_RESPONSE="$(curl --fail --silent --show-error "$CHECK_API_URL")"
-    fi
-
-    # evaluate JSON response
-    CHECK_REMOTE_COMMIT="$(echo "$CHECK_API_RESPONSE" | php -r "
-        \$json = json_decode(stream_get_contents(STDIN), true);
-        if (\$json !== null) {
-            if (isset(\$json['ref']) && (\$json['ref'] === 'refs/$CHECK_REMOTE_REF')) {
-                if (isset(\$json['object']) && isset(\$json['object']['sha'])) {
-                    echo \$json['object']['sha'];
-                }
-            }
-        }
-    ")"
-
-    # compare source reference against the latest commit
-    if [ "$CHECK_REMOTE_COMMIT" != "$CHECK_LOCAL_COMMIT" ]; then
-        echo "Latest local commit '$CHECK_LOCAL_COMMIT' doesn't match latest remote commit '$CHECK_REMOTE_COMMIT'; aborting..." >&2
-        exit 1
-    fi
-
-    echo
-fi
-
-# push changes
-printf 'Pushing changes...\n'
-git push
-
-echo
diff --git a/_build/tools/github-setup.sh b/_build/tools/github-setup.sh
deleted file mode 100755
index a9697cb..0000000
--- a/_build/tools/github-setup.sh
+++ /dev/null
@@ -1,37 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Prepares a GitHub repo for deployment
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# environment variables
-# GITHUB_OAUTH_TOKEN    GitHub authentication token, see https://github.com/settings/tokens
-
-# print "parameters" (we don't have any)
-echo "Setup repo..."
-echo
-
-# check for git repo
-if ! git rev-parse --git-dir > /dev/null 2>&1; then
-    echo "Not a git repo; aborting..." >&2
-    exit 1
-fi
-
-# setup git
-printf 'Preparing repo...\n'
-git config push.default simple
-git config user.name "Travis CI"
-git config user.email "travis-ci@picocms.org"
-
-if [ -n "$GITHUB_OAUTH_TOKEN" ]; then
-    git config credential.helper 'store --file=.git/credentials'
-    (umask 077 && echo "https://GitHub:$GITHUB_OAUTH_TOKEN@github.com" > .git/credentials)
-fi
-
-echo
diff --git a/_build/tools/update-cloc-stats.sh b/_build/tools/update-cloc-stats.sh
deleted file mode 100755
index 7c3396a..0000000
--- a/_build/tools/update-cloc-stats.sh
+++ /dev/null
@@ -1,91 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Updates the cloc statistics files
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# parameters
-TARGET_FILE="$1"     # statistics target file path
-
-# print parameters
-echo "Updating cloc statistics..."
-printf 'TARGET_FILE="%s"\n' "$TARGET_FILE"
-echo
-
-# create cloc statistics
-create_cloc_stats() {
-    local CLOC_FILE="$1"
-    shift
-
-    cloc --yaml --report-file "$CLOC_FILE" \
-        --progress-rate 0 \
-        --read-lang-def <(
-            echo "JSON"
-            echo "    filter remove_matches ^\s*$"
-            echo "    extension json"
-            echo "    3rd_gen_scale 2.50"
-            echo "Twig"
-            echo "    filter remove_between_general {# #}"
-            echo "    extension twig"
-            echo "    3rd_gen_scale 2.00"
-            echo "Markdown"
-            echo "    filter remove_html_comments"
-            echo "    extension md"
-            echo "    3rd_gen_scale 1.00"
-            echo "Apache config"
-            echo "    filter remove_matches ^\s*#"
-            echo "    filter remove_inline #.*$"
-            echo "    extension htaccess"
-            echo "    3rd_gen_scale 1.90"
-        ) \
-        --force-lang PHP,php.dist \
-        --force-lang YAML,yml.template \
-        "$@"
-}
-
-# remove header from cloc statistics
-clean_cloc_stats() {
-    local LINE=""
-    local IS_HEADER="no"
-    while IFS='' read -r LINE || [[ -n "$LINE" ]]; do
-        if [ "$IS_HEADER" == "yes" ]; then
-            # skip lines until next entry is reached
-            [ "${LINE:0:2}" != "  " ] || continue
-            IS_HEADER="no"
-        elif [ "$LINE" == "header :" ]; then
-            # header detected
-            IS_HEADER="yes"
-            continue
-        fi
-
-        echo "$LINE"
-    done < <(tail -n +3 "$1")
-}
-
-# create temporary file
-printf 'Creating temporary file...\n'
-TMP_FILE="$(mktemp)"
-[ -n "$TMP_FILE" ] || exit 1
-echo
-
-# create statistics
-printf 'Creating statistics...\n'
-create_cloc_stats "$TMP_FILE" \
-    lib index.php
-echo
-
-# remove headers from cloc statistics
-printf 'Writing statistics file without header...\n'
-clean_cloc_stats "$TMP_FILE" > "$TARGET_FILE"
-echo
-
-# remove temporary file
-printf 'Removing temporary file...\n'
-rm "$TMP_FILE"
-echo
diff --git a/_build/tools/update-phpdoc-list.sh b/_build/tools/update-phpdoc-list.sh
deleted file mode 100755
index 06cfba6..0000000
--- a/_build/tools/update-phpdoc-list.sh
+++ /dev/null
@@ -1,78 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Updates the phpDoc list
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-# parameters
-LIST_FILE_PATH="$1"      # target file path
-LIST_ID="$2"             # phpDoc ID
-LIST_TYPE="$3"           # phpDoc type
-LIST_TITLE="$4"          # phpDoc title
-LIST_LAST_UPDATE="$5"    # phpDoc last update
-
-# print parameters
-echo "Updating phpDoc list..."
-printf 'LIST_FILE_PATH="%s"\n' "$LIST_FILE_PATH"
-printf 'LIST_ID="%s"\n' "$LIST_ID"
-printf 'LIST_TYPE="%s"\n' "$LIST_TYPE"
-printf 'LIST_TITLE="%s"\n' "$LIST_TITLE"
-printf 'LIST_LAST_UPDATE="%s"\n' "$LIST_LAST_UPDATE"
-echo
-
-# create temporary file
-printf 'Creating temporary file...\n'
-LIST_TMP_FILE="$(mktemp)"
-[ -n "$LIST_TMP_FILE" ] || exit 1
-
-exec 3> "$LIST_TMP_FILE"
-
-# walk through phpDoc list
-printf 'Walking through phpDoc list...\n'
-
-DO_REPLACE="no"
-DID_REPLACE="no"
-while IFS='' read -r LINE || [[ -n "$LINE" ]]; do
-    if [ "$DO_REPLACE" == "yes" ]; then
-        # skip lines until next entry is reached
-        [ "${LINE:0:2}" != "  " ] || continue
-        DO_REPLACE="no"
-
-    elif [ "$LINE" == "- id: $LIST_ID" ]; then
-        # update existing entry
-        printf 'Updating existing entry...\n'
-        printf -- '- id: %s\n' "$LIST_ID" >&3
-        printf -- '  type: %s\n' "$LIST_TYPE" >&3
-        printf -- '  title: %s\n' "$LIST_TITLE" >&3
-        printf -- '  last_update: %s\n' "$LIST_LAST_UPDATE" >&3
-
-        DO_REPLACE="yes"
-        DID_REPLACE="yes"
-        continue
-    fi
-
-    echo "$LINE" >&3
-done < "$LIST_FILE_PATH"
-
-# add new entry
-if [ "$DID_REPLACE" == "no" ]; then
-    printf 'Adding new entry...\n'
-    printf -- '- id: %s\n' "$LIST_ID" >&3
-    printf -- '  type: %s\n' "$LIST_TYPE" >&3
-    printf -- '  title: %s\n' "$LIST_TITLE" >&3
-    printf -- '  last_update: %s\n' "$LIST_LAST_UPDATE" >&3
-fi
-
-exec 3>&-
-
-# move temporary file
-printf 'Replacing phpDoc list...\n'
-mv "$LIST_TMP_FILE" "$LIST_FILE_PATH"
-
-echo
diff --git a/_build/tools/update-version-file.sh b/_build/tools/update-version-file.sh
deleted file mode 100755
index 79afa36..0000000
--- a/_build/tools/update-version-file.sh
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/usr/bin/env bash
-
-##
-# Updates the version file
-#
-# @author  Daniel Rudolf
-# @link    http://picocms.org
-# @license http://opensource.org/licenses/MIT
-#
-
-set -e
-
-. "$(dirname "$0")/functions/parse-version.sh.inc"
-
-# parameters
-VERSION_FILE_PATH="$1"  # target file path
-VERSION_STRING="$2"     # version string (e.g. 1.0.0-beta.1+7b4ad7f)
-
-# print parameters
-echo "Generating version file..."
-printf 'VERSION_FILE_PATH="%s"\n' "$VERSION_FILE_PATH"
-printf 'VERSION_STRING="%s"\n' "$VERSION_STRING"
-echo
-
-# evaluate version string (see http://semver.org/)
-printf 'Evaluating version string...\n'
-if ! parse_version "$VERSION_STRING"; then
-    echo "Invalid version string; skipping..." >&2
-    exit 1
-fi
-
-# generate version file
-printf 'Updating version file...\n'
-echo -n "" > "$VERSION_FILE_PATH"
-exec 3> "$VERSION_FILE_PATH"
-
-printf 'full: %s\n' "$VERSION_FULL" >&3
-printf 'name: %s\n' "$VERSION_NAME" >&3
-printf 'milestone: %s\n' "$VERSION_MILESTONE" >&3
-printf 'stability: %s\n' "$VERSION_STABILITY" >&3
-printf 'id: %d\n' "$VERSION_ID" >&3
-printf 'major: %d\n' "$VERSION_MAJOR" >&3
-printf 'minor: %d\n' "$VERSION_MINOR" >&3
-printf 'patch: %d\n' "$VERSION_PATCH" >&3
-printf 'suffix: %s\n' "$VERSION_SUFFIX" >&3
-printf 'build: %s\n' "$VERSION_BUILD" >&3
-
-exec 3>&-
-
-echo