docs: add Argos badge

[gregberge]

Just some badges to say that it's covered by Argos.

[netlify]

✅ [V2]

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 68	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/installation	🟠 68	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/category/getting-started	🟠 77	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog	🟠 76	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 63	🟢 97	🟢 100	🟢 100	🟠 89	Report
/blog/tags/release	🟠 76	🟢 100	🟢 100	🟠 80	🟠 89	Report
/blog/tags	🟠 78	🟢 100	🟢 100	🟢 90	🟠 89	Report

[slorber]

thanks 👍