refactor: simplify basic layout (#1039)

A dynamically expanding/collapsing topbar is difficult to maintain and not very useful.

_javascript/modules/layouts/topbar.js

@@ -1,9 +1,5 @@
-import { convertTitle } from '../components/convert-title';
 import { displaySearch } from '../components/search-display';
-import { switchTopbar } from '../components/topbar-switcher';
 
 export function initTopbar() {
-  convertTitle();
   displaySearch();
-  switchTopbar();
 }