Integrate automatic typehinting

[kaitj]

Describe the feature you'd like to see
Make use of the sphinx extension autodoc_docstring_signature (or whichever extension is relevant) to automatically pick up type hints and drop the repeated type hint that is manually written in the docstrings.

[kaitj]

I am at a bit of a loss for this one - open to any ideas here.

1. Type hinting is automatic for the inputs, but, it doesn't seem to like to link to the correct documentation when using something like PathLike. It only links if os.PathLike is used, though I would like to avoid importing all of os if only PathLike is used. Something similar is happening with numpy, but that is a bit more difficult to debug.
2. Return types (afaik) have to be explicitly stated in the docstring.

[tkkuehn]

Just so I'm totally clear on the issue here, is sphinx-autodoc-typing the extension you tried here?

[kaitj]

This is still using ``sphinx.ext.autodoc` - was trying to replicate the working mapping from snakebids

[kaitj]

This ended up getting fixed by updates to the doc requirements to get it working again in #14.