[llvm] [Offload] Add Offload API Sphinx documentation (PR #147323)

[Kenneth Benzie via llvm-commits]

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kbenzie wrote:

It does, that's where I copied the `llvm-html` theme in `llvm/docs/themes` from in the second commit.

Unfortunately due to how Sphinx works it's not possible to reference static resources outside of the Sphinx source directory, `offload/docs` in this case.

If this isn't desirable, I could do the theme copy in CMake and add that to the ignore file?



https://github.com/llvm/llvm-project/pull/147323