docs: add Pearl UI website to showcase

[agrawal-rohit]

Motivation

Adding another example website to the Docusaurus showcase

Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

[facebook-github-bot]

Hi @agrawal-rohit!

Thank you for your pull request and welcome to our community.

Action Required

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[Josh-Cena]

Thanks, nice site, just remember to sign the CLA

[netlify]

✔️ [V2]
Built without sensitive environment variables

🔨 Explore the source changes: 61a9327

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/6193712f2dd0b400072c94cb

😎 Browse the preview: https://deploy-preview-5955--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	64
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-5955--docusaurus-2.netlify.app/

[Josh-Cena]

Friendly ping @agrawal-rohit we would definitely close PRs without a CLA after two weeks of inactivity.

[Josh-Cena]

Hi @agrawal-rohit we are closing this PR because we can't merge PRs without CLA. If you are back, feel free to sign the CLA and reopen the PR, and we will happily merge it :D

[agrawal-rohit]

Hey, sorry about that. I have signed the CLA, which should be reflected in your systems after an hour or so.

Could you reopen this PR and merge it now?

[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!

[Josh-Cena]

Yep! @agrawal-rohit It's all good now. 👍 Thanks!