docs(website): Comparison with Rspress

[DevJoaoLopes]

Motivation

Adds comparison to rspress, helping other developers get a clearer view of the differences

Test Plan

preview

Test links

https://deploy-preview-10822--docusaurus-2.netlify.app/docs/#rspress

Related issues/PRs

Closes #10732

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[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	2d43c2e
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/677cfe5e3d1d730008005007
😎 Deploy Preview	https://deploy-preview-10822--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	Report
/	🔴 49	🟢 98	🟢 96	🟢 100	Report
/docs/installation	🔴 49	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 73	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 63	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🔴 46	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 63	🟢 96	🟢 100	🟠 86	Report
/blog/tags	🟠 73	🟢 100	🟢 100	🟠 86	Report

[slorber]

Thanks, just editing a few things before merge