Replaced the Google groups button with a link

The Google groups link is now under the "Follow" buttons in a separate
space.
I thought this looked better than the button, which I always thought
looked out of place.  This area can also be used for other links
that don't have a fancy button.
Added links to Instagram, Randalls, and Amazon Smile
Merge pull request #47 from zachwhaley/add-social-media-buttons

Created a space for links related to GPA, Central Texas