simplify chat room URL

validata_ui/templates/base_template.html

@@ -82,7 +82,7 @@
             <li><a href="/api/v1/apidocs" target="_blank">API</a></li>
             <li><a href="https://git.opendatafrance.net/validata" target="_blank">Code source</a></li>
             <li><a href="https://scdl.opendatafrance.net/docs" target="_blank">Documentation</a></li>
-            <li><a href="https://riot.im/app/#/room/!grYuWajLztzrYUfnez:jailbreak.paris" target="_blank">Salon de
+            <li><a href="https://riot.im/app/#/room/#validata:jailbreak.paris" target="_blank">Salon de
                     discussion public</a></li>
         </ul>
     </footer>