docs: rebuild mkdocs site output

[GeorgePearse]

Summary

Regenerates the committed MkDocs output under site/ so it matches the current docs sources.

Notes

• This is a generated-artifacts PR; the diff is large and mostly HTML/asset churn (hashed filenames, search index, sitemap).
• Generated with mkdocs build in this environment.

Testing

• mkdocs build (no link-check performed).

[openhands-ai]

Looks like there are a few issues preventing this PR from being merged!

• GitHub Actions are failing:
  • Performance Benchmarks

If you'd like me to help, just leave a comment, like

@OpenHands please fix the failing actions on PR #11 at branch `docs/site-rebuild`

Feel free to include any additional details that might help me get this PR into a better state.

_{^{You can manage your notification settings}}