Merge Updates from dev/notifications

Improvements

Favorite cards are smaller now
The "Sig Login" and "Discover Artshow" cards have been removed from the user dashboard
Chats have been renamed to messages
A "Telegram successfully linked" text is now displayed in the user settings
The current chat is now highlighted
Chats can now be activated for departments
Group registrations can now be activated in sigEvents
Changes
The field "departments" has been removed from the chats table and created on user_role_id with a reference

Group registrations are now fixed, previously a participant could remove the slot owner