add tracker rules section

src/config/app.php.example

@@ -119,12 +119,14 @@ define('TRACKER_LINKS', (object)
       'announce' => 'http://[201:23b4:991a:634d:8359:4521:5576:15b7]/announce',
       'stats'    => 'http://[201:23b4:991a:634d:8359:4521:5576:15b7]/stats',
       'scrape'   => 'http://[201:23b4:991a:634d:8359:4521:5576:15b7]/scrape',
+      'rules'    => 'yggdrasil only',
     ],
     'Tracker 2' => (object)
     [
       'announce' => 'http://[200:1e2f:e608:eb3a:2bf:1e62:87ba:e2f7]/announce',
       'stats'    => 'http://[200:1e2f:e608:eb3a:2bf:1e62:87ba:e2f7]/stats',
       'scrape'   => 'http://[200:1e2f:e608:eb3a:2bf:1e62:87ba:e2f7]/scrape',
+      'rules'    => 'yggdrasil only',
     ],
     // ...
   ]