update footer with next release codename and corrected matrix link

customize.dist/about.html

@@ -106,7 +106,7 @@
                     <div class="col">
                         <ul class="list-unstyled">
                             <li class="title" data-localization="footer_contact"><li>
-                            <li><a href="https://riot.im/app/#/room/!cryptpad:matrix.org" target="_blank" rel="noopener noreferrer">Chat</a></li>
+                            <li><a href="https://riot.im/app/#/room/#cryptpad:matrix.org" target="_blank" rel="noopener noreferrer">Chat</a></li>
                             <li><a href="https://twitter.com/cryptpad" target="_blank" rel="noopener noreferrer">Twitter</a></li>
                             <li><a href="https://github.com/xwiki-labs/cryptpad" target="_blank" rel="noopener noreferrer">GitHub</a></li>
                             <li><a href="/contact.html">Email</a></li>
@@ -114,7 +114,7 @@
                     </div>
             </div>
         </div>
-            <div class="version-footer">CryptPad v1.6.0 (Grootslang)</div>
+            <div class="version-footer">CryptPad v1.6.0 (Hodag)</div>
     </footer>
 
 </body>