docs: convert Python API docs to Sphinx Material theme

[cwhite911]

Converting the Python API documentation to use the Sphinx Material theme styled to match the main GRASS documentation.

Example View

[petrasovaa]

The heading style causing "Script.Array Module" should be removed

[cwhite911]

This PR is at a point where the bulk of the modifications that could be done are done. There are still some remaining issues see Issue #5619 that we can resolve moving forward as we set priorities.

Here are some screenshots to give you an example of the current state.

Getting Started (index.html)

Scripting API

script package (script.html)

This one is really long, but I think we can improve it by tweaking some of the sphinx-apidoc settings where it will break the code base into smaller files with -e, --separate put documentation for each module on its own page

PyGRASS API

Introduction to Raster classes

GRASS Jupyter API (grass.jupyter package)

[veroandreo]

Looks fantastic!