Remove scss lang directives from Vue SFC style tags; add eslint rule

[zackkrida]

Fixes

Fixes #1087 by @zackkrida

Description

Converts all Vue SFCs to plain css in the <style> tags. Also adds an eslint rule to prevent contributors from using scss or any lang in Vue SFCs.

Testing Instructions

• pnpm i and try to add a lang to a style block in a Vue SFC
• Observe that modified pages look correct/consistent with their original appearances.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[krysal]

LGTM!

[krysal]

This sounds like it's allowed not to indicate the lang attribute instead of prohibiting it, a bit confusing to me.

[zackkrida]

I agree!

[zackkrida]

@krysal I added a comment to make this clearer, hopefully.

[obulat]

The locale selector strings are still there in the .pot file. I guess if we delete them from the JSON file, they will be removed from .pot, too?

[obulat]

I've added a couple of change requests in form of a PR: #1201. Other than that, everything LGTM! I thought this would require many more changes, especially around tabs.