fix(website): fix website manifest.json name "Docusaurus v2" to just "Docusaurus"

[volcanofr]

Updated the "name" field to v3 instead of v2

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Docusaurus is not in v2 anymore.

Test Plan

N/A

Related issues/PRs

N/A

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[volcanofr]

Also currently the colors are shades of blue.

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	2d7d0e9
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/662136179222510008b742e9
😎 Deploy Preview	https://deploy-preview-10049--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
/	🟠 65	🟢 98	🟢 96	🟢 100	🟠 88	Report
/docs/installation	🟠 68	🟢 96	🟢 100	🟢 100	🟠 88	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog	🟠 69	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 63	🟢 96	🟢 100	🟢 100	🟠 88	Report
/blog/tags/release	🟠 70	🟢 100	🟢 100	🟠 80	🟠 88	Report
/blog/tags	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report