Slightly modernize Aphlict server status page

Summary:
Ref T4324. Add a real `Application` class. Use modern UI elements.

@chad, we could use an icon :3

Test Plan: {F114477}

Reviewers: chad, btrahan

Reviewed By: chad

CC: chad, aran

Maniphest Tasks: T4324

Differential Revision: https://secure.phabricator.com/D8254

src/aphront/configuration/AphrontDefaultApplicationConfiguration.php

@@ -48,15 +48,6 @@ class AphrontDefaultApplicationConfiguration
         'keyboardshortcut/' => 'PhabricatorHelpKeyboardShortcutController',
       ),
 
-      '/notification/' => array(
-        '(?:(?P<filter>all|unread)/)?'
-          => 'PhabricatorNotificationListController',
-        'panel/' => 'PhabricatorNotificationPanelController',
-        'individual/' => 'PhabricatorNotificationIndividualController',
-        'status/' => 'PhabricatorNotificationStatusController',
-        'clear/' => 'PhabricatorNotificationClearController',
-      ),
-
       '/debug/' => 'PhabricatorDebugController',
     );
   }