Update sphinxcontrib-napoleon to sphinx.ext.napoleon

[ianyfan]

sphinxcontrib-napoleon is obsolete and also breaks with Python 3.10

napoleon_google_docstring = True
napoleon_numpy_docstring = False

are defaults in sphinx.ext.napoleon so I removed them (but there may still be value in explicitly mentioning them)

The only remaining reference is a link in the README to an example of style guide: https://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html but if there is a better example that could also be replaced

[Rocamonde]

Thanks for doing this. I think that removing defaults makes sense. For the remaining link, we could use https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings

[ianyfan]

That link is already present, the napoleon link is given as an example

[AdamGleave]

LGTM, feel free to merge after updating link + tests passing.

For the link, what about https://www.sphinx-doc.org/en/master/usage/extensions/example_google.html -- I just googled for "sphinx example google style python docstrings" and it came up ;), but looks official.

[codecov]

Codecov Report

Merging #65 (5b2cbcf) into master (3d2cd41) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #65   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           26        26           
  Lines          982       982           
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  Hits           982       982           

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[ianyfan]

Updated commit with the new link, thanks