Add a demonstrational notebook and prepare for notebook usage

[d33bs]

Description

This PR adds a demonstration notebook to the documentation and prepares CytoTable for use within notebooks. I found while working on this that I needed to adjust the warnings (so one doesn't witness warnings we can't avoid through this package from sub-dependencies) and also remove a DuckDB configuration which no longer applies (and appears to require a new dependency from ipywidgets if invoked, triggering an exception).

Aside, I also noticed that mypy was triggered by my changes in unusual ways that could take a long time to figure out and might be false positives. In general, my feeling is that we should move away from mypy and instead use ty or similar projects for modernized and perhaps easier to understand type linting. I'll create a new issue on this front.

Note: myst-parser was replaced by myst-nb to help avoid circular sphinx dependencies (otherwise results in errors).

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

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[d33bs]

Thanks @gwaybio ! Merging this in after responding to your changes.