new inner layout

- one main controlling script (cobalt.js).
- added api server name to serverInfo endpoint.
- one dockerfile.
- less mess.

src/front/cobalt.js

@@ -19,8 +19,6 @@ const exceptions = { // used for mobile devices
     "vQuality": "720"
 };
 
-let apiURL = '';
-
 let store = {};
 
 function changeAPI(url) {