Add new overboards to header bar

inc/instance-config.php

@@ -27,6 +27,8 @@ $config['boards'] = array(
 
 $config['prepended_foreign_boards'] = array(
     'overboard' => '/overboard/',
+    'sfw' => '/sfw/',
+    'alt' => '/alt/',
     'cytube' => 'https://tv.leftypol.org/'
 );