Notifications

[acidbubbles]

Notifications:

• MongoDB collection with index of notifications
• Mark as read keeps it in the UI but deletes from the backend
• Max 100 notifications (hardcoded)
• We still need to find a place for the bell icon, to move somewhere before merging (<NotificationsIcon />)
• Uses websockets
• Implemented for Invite Accepted, Invite Refused (sender) and Removed From Chat (participant).
• I left a Ping button to test the notifications easily, to remove before merging.
• I refactored the invites, a lot of the logic was in the db class

It's technically ready for review, we just need to decide on a place for the bell icon and remove the temporary Ping button.

[acidbubbles]

Now showing sent invites too.