chore: drop postcss dep

[manuel3108]

Relates #828
Will do a couple more over the next week for the other AST's. I was initially thinking of creating one giant pr, but looks like we can properly separate them.

Remove the test for comments, because I don't see a way how they are store in the svelte ast. We can easily re-add that once we know how it should work

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commit: e00b33e

[manuel3108]

Noooo, another missing node in print(). Making this a draft