Frontent dev env (#247)

* Added frontend development files/environment

* More items-categories related removals

* Improvements in pages templates (inc. static pages)

* Improvements in video player

* Added empty home page message + cta

* Updates in media, playlist and management pages

* Improvements in material icons font loading

* Replaced media & playlists links in frontend dev-env

* frontend package version update

* chnaged frontend dev url port

* static files update

* Changed default position of theme switcher

* enabled frontend docker container

frontend/packages/player/config/rollup.config.js

@@ -0,0 +1,6 @@
+import rollup_builds from './includes/rollup_builds';
+import pckg from '../package.json';
+
+const dists = rollup_builds('./src/index.js', './out', pckg);
+
+export default [dists.browser('./dist/mediacms-player.js')];