docs(website): fix code block Crowdin issue

[slorber]

Fix site can't deploy because Crowdin download badly formatted markdown with bad code block backticks

https://app.netlify.com/sites/docusaurus-2/deploys/6273b760dc5aaf0008442f3b

This leads to Docusaurus thinking some links are inside a code block, leading to broken links (unresolved md paths)

https://app.netlify.com/sites/docusaurus-2/deploys/6273b760dc5aaf0008442f3b

Also prod website for FR:

https://docusaurus.io/fr/docs/next/installation

---

Solution is to apply mdx-code-block only around JSX tags so that it doesn't mess up with Crowdin

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	2a60dec
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/6273cf04dc5aaf000847888d
😎 Deploy Preview	https://deploy-preview-7345--docusaurus-2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 65	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 83	🟢 99	🟢 100	🟢 100	🟢 90	Report

[github-actions]

Size Change: 0 B

Total Size: 807 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	51.4 kB
website/build/assets/css/styles.********.css	105 kB
website/build/assets/js/main.********.js	612 kB
website/build/index.html	38.8 kB

_{compressed-size-action}