Man-page generation is highly non-hermetic

The bazel-target //docs:man_pages is highly non-hermetic

• it invokes make, which is not a standard binary
• it assumes pandoc, nroff`` and sphinx-build` to be available, also non-standard binaries.
• Why is it using make in the first place, if there is bazel ?

So this will not work in any hermetic environment that disallows bazel to use the $PATH or any remote execution environment at all.

This should be fixed to

• not use make, just regular bazel functionality
• Depend on the necessary binaries via BCR ( https://registry.bazel.build/modules/sphinxdocs, others might need to be upstreamed first, such as pandoc).

Initially I recommend to mark it tags = ["local", "manual"] to not disrupt the buildability.