Add a note about Sass package

Created by: Fyvel

Node-sass doesn't seem to compile syntax such as @use "./variables" as V; When trying to integrate an existing set of sass modules into a React app, it can be a bit misleading (at least for me it was) to see only node-sass mentioned in the Doc

Sorry if my english isn't perfect, I'm happy to reword it if necessary

requested review from @root

requested review from @root

Created by: facebook-github-bot

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added CLA Signed label

Created by: facebook-github-bot

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

Created by: stale[bot]

This pull request has been automatically marked as stale because it has not had any recent activity. It will be closed in 5 days if no further activity occurs.

added stale label

Created by: stale[bot]

This pull request has been automatically closed because it has not had any recent activity. If you have a question or comment, please open a new issue. Thank you for your contribution!

closed