Replace Pluto notebooks with Quarto files

[sethaxen]

Loosely follows https://forem.julialang.org/kellertuer/render-quarto-tutorials-in-documenterjl-with-github-actions-3fo.

This has the benefit that the markdown part of the examples is parsed using Documenter, so we can reference docstrings in the same docs build. It has the downside that Julia's markdown parses does not parse the HTML representation of InferenceData, which is probably a dealbreaker for this PR unless we can find a workaround.