build: replaces node-sass with sass

[mcataford]

Description

node-sass is now deprecated and the suggested replacement is dart-sass. This substitutes one for the other. Major pro for this: node-sass did some heavy node-gyp building whereas this doesn't, making building-from-scratch way faster.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have used ESLint & Prettier to follow the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[mcataford]

QA: diff'ed CSS output before and after the change, they are functionally the same. sass seems to insert a handful of extra newlines, but otherwise, same stylesheet. 👍

[github-actions]

🎉 This PR is included in version 8.0.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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