Add prettier-plugin-astro to the monorepo

[Princesseuh]

Changes

Add our Prettier plugin to our Prettier config. This will run in CI on every .astro files in the repo (apart from fixtures)

A lot of issues in our Prettier plugin have been fixed since the last attempt at adding it, however due to two compiler issues (withastro/compiler#485, withastro/compiler#318) four files had to be ignored for now

Testing

Tested manually, but not really relevant

Docs

N/A

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Latest commit: 16a5a0a

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[Princesseuh]

Prettier doesn't like that those folders don't exist, it instantly crashes with an error that the folder doesn't exist when plugins are enabled.

I tried ignoring those folders and disabling automatic plugin search, but that didn't solve the issue. I saw a few issues on their repo about this (notably a lot of people talking about MongoDB and Docker folders not existing)

[FredKSchott]

I ran format and checked the entire diff, and everything looked good! I'm going to merge so that we get some more time with these changes in the monorepo before v1.0.0 release