Google and duckduckgo link to docs for very old versions of pyo3

[hoodmane]

If I google for pyo3, I find:
https://pyo3.rs/v0.10.1/
DuckDuckGo gives me:
https://pyo3.rs/v0.15.1/

Both for quite old versions. Not sure whether there is anything that you all can fix here, but thought you might like a heads up.

[davidhewitt]

I think we should be able to set headers on the netlify pages to force search engines to index only the latest docs. I last attempted this in #3264 but likely missed something.

[Cheukting]

Have we tried adding sitemap to the built website? Maybe we can try adding this to the netify.toml: https://github.com/netlify-labs/netlify-plugin-sitemap

[davidhewitt]

Great idea to add a sitemap, I don't think we have one. I think that plugin might break if we implement #5081, but maybe rust-lang/mdBook#1491 gives us solutions?

[Cheukting]

Right now I think we are blocked by rxdn/mdbook-sitemap-generator#7 but yes we can add that when this got resolved