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

static/lib/material-icons/material-icons.css

@@ -1,23 +1,23 @@
 @font-face {
-    font-family: 'Material Icons';
-    font-style: normal;
-    font-weight: 400;
-    src: url('../../lib/material-icons/v77/icons.woff2') format('woff2');
-    font-display: swap;
+  font-family: 'Material Icons';
+  font-style: normal;
+  font-weight: 400;
+  src: url('../../lib/material-icons/v77/icons.woff2') format('woff2');
+  font-display: block;
 }
 
 .material-icons {
-    font-family: 'Material Icons';
-    font-weight: normal;
-    font-style: normal;
-    font-size: 24px;
-    line-height: 1;
-    letter-spacing: normal;
-    text-transform: none;
-    display: inline-block;
-    white-space: nowrap;
-    word-wrap: normal;
-    direction: ltr;
-    -webkit-font-feature-settings: 'liga';
-    -webkit-font-smoothing: antialiased;
-}
+  font-family: 'Material Icons';
+  font-weight: normal;
+  font-style: normal;
+  font-size: 24px;
+  line-height: 1;
+  letter-spacing: normal;
+  text-transform: none;
+  display: inline-block;
+  white-space: nowrap;
+  word-wrap: normal;
+  direction: ltr;
+  -webkit-font-feature-settings: 'liga';
+  -webkit-font-smoothing: antialiased;
+}