[DOC]: links to subpackages on the landing page of PR links go to existing documentation

[cpcloud]

Is this a duplicate?

• [x] I confirmed there appear to be no duplicate issues for this bug and that I agree to the Code of Conduct

Is this for new documentation, or an update to existing docs?

New

Describe the incorrect/future/missing documentation

Clicking on any of these links from this PR preview https://nvidia.github.io/cuda-python/pr-preview/pr-1230/latest/:

I am taken to https://nvidia.github.io/cuda-python/cuda-core/latest, when I click on the cuda.core link.

Ideally I would be routed to the correct link for the pull request preview.

If this is a correction, please provide a link to the incorrect documentation. If this is a new documentation request, please link to where you have looked.

No response