new inner layout

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

src/front/cobalt.css

@@ -664,10 +664,6 @@ button:active,
 #pd-share {
     display: none;
 }
-#hop-attribution {
-    display: block;
-    text-align: right;
-}
 #about-donate-footer::before {
     content: "";
     position: absolute;

src/front/cobalt.js

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