source + license in about

server/templates/about.html.j2

@@ -34,5 +34,8 @@
       <li><code>Points</code> an instance score based on the availability over the last 30 and 120 days, together with the version.</li>
       <li>(api only) <code>Ping</code> last health check response time (ms).</li>
     </ul>
+
+    <p><a href="https://github.com/4cuck/nitter-status">Sourcecode</a></p>
+    <p>License: AGPL3</p>
   </body>
 </html>