docs: add replicad to showcase

[sgenoud]

Motivation

The documentation of replicad is using Docusaurus v2. It could be cool to add it in the showcase page.

Have you read the Contributing Guidelines on pull requests?

yes

Test plan

Run yarn run start:website and check that the page http://localhost:3000/showcase is rendered properly.

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[netlify]

✔️ [V2]
Built without sensitive environment variables

🔨 Explore the source changes: bab8510

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/61ef5693fd9b8c00082773d3

😎 Browse the preview: https://deploy-preview-6459--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	84
🟢 Accessibility	100
🟢 Best practices	93
🟢 SEO	100
🟢 PWA	92

Lighthouse ran on https://deploy-preview-6459--docusaurus-2.netlify.app/

[facebook-github-bot]

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

[Josh-Cena]

Great, thanks!