Various quick CI fixups

[bpkroth]

Pull Request

Title

Quick fixups to the documentation build.

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Description

• Expands one of the ignored warnings.
• Reformats the sphinx conf for black and pylint.
• Removes a warning from that file around redefinition of html_theme_path.
• Adds a dependency requirement tweak for pyparsing when installing under python 3.8 (unrelated other CI bug).
• Adds a workaround to a mypy false positive with in checking np.e as a "deleted variable" (e.g., e is used in a try/except block)

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Type of Change

• 🛠️ Bug fix
• 📝 Documentation update

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Testing

• Ran make doc and make check-doc.
• Ran make notebook-exec-test.

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Additional Notes (optional)

This is a quick fix to get the CI pipeline working again.
The more complete fix to remove warning ignores from doc generation, improve cross reference linking, etc. will be handled later in #869

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