adding shub link back in, so people can stumble on it :)

Author: vsoch

_data/topnav.yml

@@ -16,8 +16,8 @@ topnav_dropdowns:
           external_url: https://groups.google.com/a/lbl.gov/forum/#!forum/singularity
         - title: Singularity on Stack Overflow
           external_url: http://stackoverflow.com/questions/tagged/singularity
-#        - title: Singularity Hub
-#          external_url: https://github.com/singularityware/singularity-hub
+        - title: Singularity Hub
+          external_url: https://www.singularity-hub.org/faq
         - title: Slack
           external_url: https://singularity-container.slack.com
     - title: People