migrate to unified "capabilities" API

src/App.svelte

@@ -1,6 +1,6 @@
 <script>
     import Feed from './Feed.svelte';
-    import { Client, server_types } from './client/client.js';
+    import { Client } from './client/client.js';
 
     let ready = Client.get().app && Client.get().app.token;
 
@@ -25,7 +25,6 @@
         });
     }
 
-
     function log_out() {
         Client.get().logout().then(() => {
             ready = false;