[DOC]: Add special compatibility section for NVRTC

### 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

As a user of CCCL with NVRTC, I would like to know:
- What headers/functionality are supported for runtime compilation with NVRTC?
- How do I use CCCL headers with NVRTC? (See https://github.com/NVIDIA/cccl/issues/5032)

I would like to see a sub-section called "NVRTC" added under "Platform Support" after [C++ Dialects](https://github.com/NVIDIA/cccl?tab=readme-ov-file#c-dialects).

This section should summarize the following:
- What headers are supported when used with NVRTC
- For example `cub/cub.cuh` is not supported, but sub-headers like `cub/block/block_reduce.cuh` *are* supported
- Unless otherwise noted(?) all `` headers should work with NVRTC?
- Pointer to NVRTC example https://github.com/NVIDIA/cccl/issues/5032

### 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_