[FEA]: Move doc-building to more standard tooling

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Area

Infrastructure

Is your feature request related to a problem? Please describe.

The requirements for doing a docs build are currently both in toolshed/setup-docs-env.sh and cuda_python/docs/environment-docs.yml, both of which are conda-specific. Instead, we should define these dependencies as a docs group in cuda_python/pyproject.toml, and have all the other pyproject.tomls point to that.

Additionally, there are build_docs.sh scripts that define a few environment variables etc., and the docs builds fail if you don't do that. For bonus points, it would be great to integrate what this does inside of conf.py so that the docs could be built in the standard way, and all of the extra commands in the Sphinx Makefile would work.

Describe the solution you'd like

pip install ./cuda_bindings[doc] would install the dependencies to build the docs, even in non-conda-based environments.

cd cuda_bindings/docs
make pdf

would work.

Describe alternatives you've considered

No response

Additional context

No response

Start by comparing toolshed/setup-docs-env.sh, cuda_python/docs/environment-docs.yml, the build_docs.sh scripts, and cuda_python/pyproject.toml. Check how the Sphinx conf.py and Makefile currently depend on environment setup, then test the requested pip install ./cuda_bindings[doc] flow and cd cuda_bindings/docs; make pdf. Done means the documentation dependencies are defined through pyproject.toml and the standard PDF build works without conda-specific setup.