Use @vseth/components components

Implements #98 (closed), #71 (closed), #96 (closed), #93 (closed), #37 (closed), #39 (closed), #23, #40 (closed), #95 (closed)

Includes !40 (merged) (and therefore implements #10 (closed))

I reimplemented a majority of the components using functional components and hooks. The general structure wasn't changed.

• Errors and loading states should always be indicated (loading states are missing in a very few places)
• I will try to remove all references to glamor as it is deprecated. There are still some inline styles I have to move to emotion.
• Currently a custom renderer is used as the old one was crashing randomly (probably due to unexpected rerendering)
• If files / admins / experts are added in the category metadata editor pressing SAVE is now necessary.

TODO:

• Navbar
• Login
• Home
• Category
• Feedback
• Mod Queue
• Scoreboard
• Submit Transcript
• Tutorial (Will probably mostly leave this as it is - I would still prefer an external slideshow instead of integrating it into the SPA)
• Upload PDF
• User Info
• Answers
• Comments
• Exam admin tools: metadata editor, add cuts, remove cuts, move cuts
• notification unread count polling
• Remove exam in category page
• Jump to answer
• Flag as inappropriate
• Expert endorsement
• File browser
• Exam panel buttons
• Print-only exam / solutions
• Move styles to emotion