chore: prepare v2.0.0-beta.21 release

[slorber]

chore: prepare v2.0.0-beta.21 release

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	f8727ed
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/6290f81bb82336000843a8c9
😎 Deploy Preview	https://deploy-preview-7513--docusaurus-2.netlify.app
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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟢 94	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 79	🟢 99	🟢 100	🟢 100	🟢 90	Report

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	d3fabc1
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/6290f9470f0aa00008df9eec
😎 Deploy Preview	https://deploy-preview-7513--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]

Size Change: +1.14 kB (0%)

Total Size: 797 kB

Filename	Size	Change
website/.docusaurus/globalData.json	52.5 kB	+186 B (0%)
website/build/assets/js/main.********.js	600 kB	+958 B (0%)

ℹ️ View Unchanged

Filename	Size
website/build/assets/css/styles.********.css	106 kB
website/build/index.html	38.9 kB

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