Add backend site management for collective topics and topics

- Introduced new backend site management features including the ability to accept, unaccept, save, edit, and display topics and collective topics.
- Added new views for editing and listing collective topics and topics.
- Implemented necessary backend logic in the `BackendSites` and `factory\BackendSites` classes to handle CRUD operations for topics and collective topics.
- Updated the layout to include links for accessing the new backend features based on user permissions.

templates/site/layout-logged.php

@@ -85,6 +85,14 @@
             <a href="/wiki/main_view/">Wiki</a>
           </li>
         <? endif;?>
+        <? if ( \controls\Users::permissions( $this -> user[ 'id' ], 'zaplecze' ) ):?>
+          <li>
+            <a href="/backend_sites/collective_topics/">Zaplecze - tematy zbiorcze</a>
+          </li>
+          <li>
+            <a href="/backend_sites/topics/">Zaplecze - tematy</a>
+          </li>
+        <? endif;?>
       </ul>
     </div>
     <div class="main">