docs(website): Announce v3.2 on website/homepage

[slorber]

Motivation

Change homepage and announcement bar to announce more easily new Docusaurus versions

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	7cfa7f5
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/66070525f501f20008a7893c
😎 Deploy Preview	https://deploy-preview-10004--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
/	🟠 53	🟢 98	🟢 96	🟢 100	🟠 88	Report
/docs/installation	🟠 57	🟢 96	🟢 100	🟢 100	🟠 88	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog	🟠 67	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 62	🟢 96	🟢 100	🟢 100	🟠 88	Report
/blog/tags/release	🟠 70	🟢 100	🟢 100	🟠 80	🟠 88	Report
/blog/tags	🟠 77	🟢 100	🟢 100	🟢 90	🟠 88	Report

[github-actions]

Size Change: -5 B (0%)

Total Size: 1.05 MB

ℹ️ View Unchanged

Filename	Size	Change
website/.docusaurus/globalData.json	91.2 kB	0 B
website/build/assets/css/styles.********.css	114 kB	0 B
website/build/assets/js/main.********.js	809 kB	-1 B (0%)
website/build/index.html	38 kB	-4 B (0%)

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