Improve usability of Sphinx Lint with pre-commit

[AlexWaygood]

See #90 (comment)

[hugovk]

Shall we release this? As a minor or patch?

[AlexWaygood]

Could do a minor release! (Not sure it qualifies for a patch release since it's not fixing a regression, really, and there's a small risk that changing the defaults here could itself introduce regressions for users?)

I think it's a useful change. It's also not a crucial change, though, so we could also wait for #87 to be ready. I'm easy either way :)

[AlexWaygood]

Actually, I changed my mind. You're right, this probably does deserve a release on its own. As things stand, the advice in the README on how to use Sphinx Lint with pre-commit is now incorrect if you're using the latest release of Sphinx Lint :)

Do you want to take care of the release, or shall I?

[hugovk]

Go for it!

Will be a good test of trusted publishing and the release checklist:

https://github.com/sphinx-contrib/sphinx-lint#releasing

[AlexWaygood]

Success! https://pypi.org/project/sphinx-lint/0.8.0/