docs(v2): add stylable site to users showcase list

[tomrav]

Motivation

We recently transitioned our stylable.io website from jekyll over to Docusaurus and so I'm adding it to your user showcase list.

Have you read the Contributing Guidelines on pull requests?

Yes

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Deploy preview for docusaurus-2 ready!

Built with commit d7ec4eb

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	91
🟢 Accessibility	96
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-4441--docusaurus-2.netlify.app/classic/

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

[slorber]

Thanks

Will just remove the tags as they don't really look appropriate for this site to me