Use gh-pages hosted rust doc while doc.rs docs are broken

[Wumpf]

What

Temporary workaround for:

• https://github.com/rerun-io/rerun/issues/8165

Please revert after we published a patch with working doc.rs

Checklist

• [x] I have read and agree to Contributor Guide and the Code of Conduct

• [x] I've included a screenshot or gif (if applicable)

• [x] I have tested the web demo (if applicable):

  • Using examples from latest main build: rerun.io/viewer
  • Using full set of examples from nightly build: rerun.io/viewer

• [x] The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG

• [x] If applicable, add a new check to the release checklist!

• [x] If have noted any breaking changes to the log API in CHANGELOG.md and the migration guide

• PR Build Summary

• Recent benchmark results

• Wasm size tracking

To run all checks from main, comment on the PR with @rerun-bot full-check.

To deploy documentation changes immediately after merging this PR, add the deploy docs label.

[github-actions[bot]]

Latest documentation preview deployed successfully.

Result	Commit	Link
✅	5c7d50c750e75000b40c9ecd4196a73f3d05fef6	https://landing-pneuc8bbe-rerun.vercel.app/docs

^{Note: This comment is updated whenever you push a commit.}

[github-actions[bot]]

Your changes can be cherry-picked to docs-latest and will be deployed immediately after merging.