Chonky UI redo

[Willdotwhite]

This is a beast, and the way I approached it definitely wasn't the best, but it's definitely new UI code that I'm a lot happier working with (with a chunk of old UI code deleted, and most pages rewritten one at a time).

Major changes:

• Use formik to create forms with internal state management
• Break out Tailwind CSS from TSX files to make them waaaay easier to read
• Inline a few of the more complex components from the previous iteration (like StyledSelector)
• Added the unused "Report DMs as not working for this user" button
• Dropped the /admin pages -> they needed a bigger overhaul anyway, and given that I think I'm the only user (excluding maybe @SlamBamActionman ?) it's just as easy to use the API

Things kept unchanged (for now):

• Use of react-query for mutation queries -> I'd like to reduce a lot of the code for our queries, but I'd like to tackle that separately to this PR
• Basic structure of the website
• Entire API stack

Future work:

• Review and argue about the random styling changes I made (most visible in Post view below)
• Catch any missed snags
• Update colour scheme and logos to 2024 colours
• Copy-edit and restyle /about page, which I just free-handed
• Lots of stuff I have no doubt I've missed

[Willdotwhite]

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