v2.2.1

Improvements:

• Feed: Posts can now be submitted out-of-order 🎉
• Feed: Posts are submitted when the "Scroll to next post" button is pressed, instead of after the scroll has finished

Bug Fixes:

• Admin: Fix upload of new studies
• Admin: Fix download of results
• Game: Fix use of the enter key to submit participant IDs
• Feed: Fix the timing of participants
• Feed: Fix the scroll to next post button in the feed