Use community forum for support not github.

interface_config.js

      * If indicated some of the error dialogs may point to the support URL for
      * help.
      */
-    SUPPORT_URL: 'https://github.com/jitsi/jitsi-meet/issues/new',
+    SUPPORT_URL: 'https://community.jitsi.org/',
 
     /**
      * Whether the connection indicator icon should hide itself based on