[DOC]: Version CCCL docs

### Is this a duplicate?

- [x] I confirmed there appear to be no [duplicate issues](https://github.com/NVIDIA/cccl/issues) for this bug and that I agree to the [Code of Conduct](CODE_OF_CONDUCT.md)

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

New

### Describe the incorrect/future/missing documentation

We currently render docs only for the latest CCCL version (main). This is sub-optimal experience for users who rely on CCCL from CTK. We should provide an interface to choose CCCL docs version, similar to this https://pandas.pydata.org/docs/reference/index.html.

### 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_