Auto hot reloading with `sphinx-autobuild`

[jbampton]

I have tested this on Linux.

We need another dev to test the batch file on Windows.

I have added this to other projects

https://github.com/sphinx-doc/sphinx-autobuild

https://github.com/sphinx-doc/sphinx-autobuild?tab=readme-ov-file#using-with-makefile

Listed as one of the best Sphinx extensions:

https://sphinx-extensions.readthedocs.io/en/latest/

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📚 Documentation preview 📚: https://cloudstack-documentation--584.org.readthedocs.build/en/584/