feat: sync Demo author with default tpl author

And remove `user_groups` from author profile for personal demo to simplify site creation.

exampleSite/content/authors/admin/_index.md

@@ -46,8 +46,8 @@ social:
 - icon: twitter
   icon_pack: fab
   link: https://twitter.com/GeorgeCushen
-- icon: graduation-cap  # OR `google-scholar`
-  icon_pack: fas  # OR `ai`
+- icon: graduation-cap  # Alternatively, use `google-scholar` icon from `ai` icon pack
+  icon_pack: fas
   link: https://scholar.google.co.uk/citations?user=sIwtMXoAAAAJ
 - icon: github
   icon_pack: fab
@@ -63,16 +63,11 @@ social:
 #   icon_pack: ai
 #   link: media/resume.pdf
 
-# Email for Contact widget or Gravatar
+# Enter email to display Gravatar (if Gravatar enabled in Config)
 email: ""
 
 # Highlight the author in author lists? (true/false)
 highlight_name: false
-
-# Organizational groups that you belong to (for People widget)
-#   Remove this if you are not using the People widget.
-user_groups:
-- Principal Investigators
 ---
 
 Nelson Bighetti is a professor of artificial intelligence at the Stanford AI Lab. His research interests include distributed robotics, mobile computing and programmable matter. He leads the Robotic Neurobiology group, which develops self-reconfiguring robots, systems of self-organizing robots, and mobile sensor networks.