Issue #1995: Remove old script for generating API docs.

automation/docs/generate_api-reference_release.sh

-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-# Print commands and fail this script if a sub script fails
-set -ex
-
-# Get version number from Gradle
-VERSION=`sed -n 's/.*componentsVersion: //p' < .buildconfig.yml`
-echo "API reference for version: $VERSION"
-
-# Generate API reference for the current state
-./gradlew docs
-
-# Move generated reference to destination
-mkdir -p ./docs/api/$VERSION
-cp -R ./build/javadoc/android-components/* ./docs/api/$VERSION/
-
-# Generate a page that links to the reference pages for every module
-python automation/docs/generate_reference_page.py $VERSION