### Description
- Add a concise installation caveat for cuRobo when Omniverse Kit/Isaac
Sim environment scripts set `PYTHONPATH`/`PYTHONHOME`, with simple
mitigations.
- Clarify `TORCH_CUDA_ARCH_LIST` usage (match GPU compute capability;
add `+PTX` for forward compatibility).
- Consolidate and document VRAM usage baselines and GPU recommendations
for both Vanilla Cube Stacking and Adaptive Bin Cube Stacking (measured
over 10 demos on RTX 6000 Ada 48 GB).
- Minor wording fixes for consistency (e.g., “adaptive bin cube
stacking”).
- **Dependencies**: None

### Type of change
- Documentation update

### Checklist
- [x] I have read and understood the contribution guidelines
- [x] I have run the `pre-commit` checks with `./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension’s `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there