Update cdist support web page.

docs/web/cdist/support.mdwn

@@ -8,7 +8,7 @@ You can join the development ***IRC channel***
 ### Mailing list
 
 Bug reports, questions, patches, etc. should be send to the
-[cdist mailing list](http://l.schottelius.org/mailman/listinfo/cdist).
+[cdist mailing list](https://groups.google.com/forum/#!forum/cdist-configuration-management).
 
 ### Linkedin
 
@@ -17,6 +17,9 @@ at [Linked in](http://www.linkedin.com/),
 you can join the
 [cdist group](http://www.linkedin.com/groups/cdist-configuration-management-3952797).
 
+### Chat
+Chat with us: [ungleich chat] (https://chat.ungleich.ch/channel/cdist).
+
 ### Commercial support
 
 You can request commercial support for cdist from