Ignore documentation errors in Sphinx config

[kroeschl]

We don't want to fiddle with docstrings or related noqas in our Sphinx configs. To avoid this, disable docs rules in docs/conf.py.

Tested by installing into a package's Poetry env and running ni-python-styleguide lint. It now doesn't complain about missing docstrings in docs/conf.py.

[github-actions]

Thank you for contributing! 👋

[mshafer-NI]

So..., my first thought was to say "no", we already have a doc-string in the suggested templates. But, it's a useless string "docs for {module}"...

And this makes adoption simpler....

Agreeing.