docs: create Docusaurus v2.4.0 release docs + changelog + release blog post

[slorber]

Motivation

Add 2.4.0 docs version + changelog + blog post + backport all docs changes from commits backported for the 2.4 release

All Docusaurus v2.4.0 links:

• code backport PR
• docs backport PR
• examples PR

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Preview links:

• https://deploy-preview-8811--docusaurus-2.netlify.app/blog/releases/2.4/
• https://deploy-preview-8811--docusaurus-2.netlify.app/changelog/2.4.0/
• https://deploy-preview-8811--docusaurus-2.netlify.app/docs/2.4.0/

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The docs have been backported manually: the renaming from md to mdx docs makes my automated command to fail:

git format-patch -k --stdout docusaurus-v2...slorber/docusaurus-v2.4-backport -- website/docs | sed 's,a/website/docs,a/website/versioned_docs/version-2.4.0,g ; s,b/website/docs,b/website/versioned_docs/version-2.4.0,g' | git apply

See also more reasons here: #8586

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	a18be61
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/641c966e5a4ba50008ec8b41
😎 Deploy Preview	https://deploy-preview-8811--docusaurus-2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 70	🟢 97	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 67	🟢 100	🟢 100	🟢 100	🟢 90	Report

[github-actions]

Size Change: +54.1 kB (+6%) 🔍

Total Size: 1.01 MB

Filename	Size	Change
website/.docusaurus/globalData.json	101 kB	+14.7 kB (+17%)	⚠️
website/build/assets/css/styles.********.css	113 kB	+200 B (0%)
website/build/assets/js/main.********.js	751 kB	+39.1 kB (+5%)	🔍
website/build/index.html	41.2 kB	+63 B (0%)

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