/**
  * CAUTION: the @Stuff turns off security checks; for this page no admin is
  *          required and no CSRF check. If you don't know what CSRF is, read
  *          it up in the docs or you might create a security hole. This is
  *          basically the only required method to add this exemption, don't
  *          add it to any other method if you don't exactly know what it does
  *
  * @NoAdminRequired
  * @NoCSRFRequired
  */
 public function index()
 {
     $params = ['everyone' => Data::countAllUsers()];
     return new TemplateResponse('sharing_group', 'main', $params);
     // templates/main.php
 }