Various changes

mobile-friendly ui updates
admin user-edit bugfix
file cleanup
added searchFields
add blog search
remove unused code
add maintenance mode config

app/models/sessions.php

@@ -36,6 +36,9 @@ class Sessions extends DatabaseModel {
         [ 'username', 'varchar', '20' ],
         [ 'token', 'varchar', '120' ],
     ];
+    public $searchFields = [
+        'username',
+    ];
     public static $activeSession = false;
 
     /**