docs: add SmartCookieWeb site to showcase

[CookieJarApps]

Motivation

I recently rebuilt the site for my app with Docusaurus and I'm really happy with how it turned out. It'd be amazing if my site was part of the Docusaurus showcase.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Built locally

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[netlify]

✔️ [V2]
Built without sensitive environment variables

🔨 Explore the source changes: df29dc2

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/620b1114f13a570007cd1f7f

😎 Browse the preview: https://deploy-preview-6676--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	63
🟢 Accessibility	100
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	92

Lighthouse ran on https://deploy-preview-6676--docusaurus-2.netlify.app/

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!