v2.2.0

Changelog:

• Posters can now be a gif
• The new Applied Data Science master is added
• Fixed some icons on the Payments page
• The signout button is back on mobile
• The bug button is removed in favor of a link to GitHub
• Fixed errors in the member edit page for users that have no study or birthdate
• Fixed bug where refreshing the member edit page broke the save button
• Admins can view groups on mobile again
• Rails and its dependencies are updated to 6.0.2.2 and sprockets is updated to version 4
• Squashed a bug in development where mailchimp config had to be commented out