Current sphinx/ contents are mostly WiP. Let's beat them into shape for
publishing on ReadTheDocs.
Integrate the API documentation generated with doxygen for the core C
API and C++ bindings into sphinx using breathe.
Update configure.ac to check for sphinx-build in addition to doxygen and
make the main Makefile trigger a sphinx build on `make doc` (although
the docs can also be generated without starting the build system by
running: `sphinx-build ./docs/ docs/sphinx-output`).
Move the introduction text from the main header into the relevant .rst
file.
Remove obsolete Doxyfile.in and create a static Doxygen under doc/ where
all the documentation now lives.
Update .gitignore where needed.
Reviewed-by: Vincent Fazio <vfazio@xes-inc.com>
Link: https://lore.kernel.org/r/20250211-improve-docs-v4-12-dc56702c2ca8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
