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/scripts/lib/.webpack/dev-server.config.ts

@@ -0,0 +1,12 @@
+import { Configuration } from 'webpack-dev-server';
+
+export function configFunc(contentBase: string): Configuration {
+  return {
+    watchOptions: {
+      poll: true,
+    },
+    contentBase: contentBase,
+    compress: true,
+    hot: true,
+  };
+}