chore: update git and prettier ignores

[G-Rath]

These are generally all pretty standard stuff, though I had not realized __pycache__ was a thing that Python generates as it turns out my IDE magically hides it from me.

I've included the tool caches even though they actually include a .gitignore with a wildcard since that doesn't stop prettier from checking the directories and I think it's nicer to be consistent between the two files. I've also included node_modules and vendor since they're traditional and are usually very big so I think it's nice having them as a just-in-case

[Copilot]

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• .prettierignore: Language not supported

[G-Rath]

Fun fact, this actually takes about 5 seconds off prettier locally for me, as I've got a lot of stuff shelved in the .idea directory 😅

[Unifex]

LGTM