Defer voteythumbs request (also prettified latex, and deferred xkcd)

[emadkhan713]

This PR should fix #101 somewhat.

However, some older commands should also be ported to the application-commands framework (advent (#68) and holidays come to mind), and subsequently deferred.

Also, this is my first OSS contribution, so I apologize if I've messed up in formatting / protocol for the PR.

[andrewj-brown]

holidays is fairly new; it looks like it doesn't have any app commands but that's because it actually has zero commands. It's just a cronjob that runs every day at 9am, generating the "Today is <thing> day!" message, so there's not really any need to "defer" a response per #101.

advent you're absolutely right about, it's a horrific monolith of a cog (and I'm saying this as the guy who wrote the starboard!) that probably should be completely stripped out and re-written. Especially considering we run giveaways, it's rather annoying that we don't have any way to easily link AoC participants to discord identities, nor opt-outs for the (many) alumni that have no desire to win.

[andrewj-brown]

As for this PR; lgtm and tested. If you could run black over the repo for code style (poetry run black uqcsbot) then I'd be happy to merge, although I'll leave it up just for a day or two so others can chime in if they wish.

[emadkhan713]

ah right, I should've read a bit more into holidays then, soz.

and yeah, maybe I'll leave advent for later, might take a bit of a while to wrap my head around.

quick q: were xkcd or latex passing beforehand? because I didn't touch the parts that failed checks

[andrewj-brown]

On my machine (and on github) black wants to reformat latex and xkcd. It's just indentation changes; not an actual problem with your code logic, just formatting.

[49Indium]

LGTM (once black passes)

[49Indium]

Looks great. I'll give it some time for others to view, but can merge in soon.
I was too hasty. Black is still having some issues. I'm going to have a look at what it is.

[49Indium]

Was very minor adjustments, which I think are due to our settings for black (a single line for xkcd.py and only a couple for latex.py). Running poetry run black uqcsbot was all I did.

[emadkhan713]

whoops! still learning the ropes, haha

[andrewj-brown]

lgtm and merging