Link to pytest-pyvista in docs

[MatthewFlamm]

Overview

Add some links to pytest-pyvista documentation.

[codecov]

Codecov Report

Merging #4153 (e4f1831) into main (a693f8d) will not change coverage.
The diff coverage is n/a.

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  Hits        19353    19353           
  Misses        897      897           

[adeak]

Super nitpicky/bikesheddy, but I wonder about the casing of "Pytest". Looking at https://docs.pytest.org it seems to me that the project styles itself as "pytest":

[akaszynski]

5896d17

[akaszynski]

We're using "title case", so I updated it in the body, but didn't update the title.

[adeak]

We could add an exception just like we do for PyVista and others. I don't insist though.

[MatthewFlamm]

I most admit I was lazy, but not that lazy, and only googled it and saw this. Their website proper consistently uses lower case. I think we could use either here.

[adeak]

So should we switch or keep titlecase?

[akaszynski]

I'm on the fence about this as well. Looking at their docs, they consistently do not capitalize it, even when it starts their sentence case titles:
https://docs.pytest.org/en/7.2.x/contents.html

Honestly, I think it looks weird if it's the only word not capitalized in our section titles. I think an exception would be gRPC, where GRPC (all caps) or Grpc would look strange. In this case, I think we're fine with "as-is" since it doesn't "look weird."

[akaszynski]

Calling this good to go.