Extract frontend code into own repository

scripts/build_frontend

@@ -6,24 +6,15 @@ if [ ${PWD##*/} == "scripts" ]; then
     cd ..
 fi
 
-scripts/build_js $1
+cd homeassistant/components/frontend/www_static/home-assistant-polymer
+npm install
+npm run frontend_prod
 
-# To build the frontend, you need node, bower, vulcanize and html-minifier
-# npm install -g bower vulcanize html-minifier
-
-# Install dependencies
-cd homeassistant/components/frontend/www_static/polymer
-bower install
-cd ..
-cp polymer/bower_components/webcomponentsjs/webcomponents-lite.min.js .
-
-vulcanize --inline-css --inline-scripts --strip-comments polymer/home-assistant.html > frontend.html
-
-# html-minifier crashes on frontend, minimize kills the CSS
-# html-minifier --config-file polymer/html-minifier.conf -o frontend.html frontend.html
+cp bower_components/webcomponentsjs/webcomponents-lite.min.js ..
+cp build/frontend.html ..
 
 # Generate the MD5 hash of the new frontend
-cd ..
+cd ../..
 echo '""" DO NOT MODIFY. Auto-generated by build_frontend script """' > version.py
 if [ $(command -v md5) ]; then
     echo 'VERSION = "'`md5 -q www_static/frontend.html`'"' >> version.py