DOC: mkdocs migration + intersphinx broken (seeminly) #3542

Describe the issue linked to the documentation

See https://app.readthedocs.org/projects/annbatch/builds/30055752/ + https://github.com/scverse/annbatch/pull/72/files#diff-85933aa74a2d66c3e4dcdf7a9ad8397f5a7971080d34ef1108296a7c6b69e7e3

When I moved to latest, all/a lot of the intersphinx links broke. It seems there is an object.inv file, so that's not the issue (I got this one just now, converted to json).

I think this has to do with how pages are handled? So https://zarr.readthedocs.io/en/latest/user-guide/config/ and https://zarr.readthedocs.io/en/stable/user-guide/config.html both exist, both https://zarr.readthedocs.io/en/latest/user-guide/config.html does not. I also don't see user-guide in the new inventory, but do see it in the old one, so I think that might be the issue

Suggested fix for documentation

No response