fix(docs): Add screenshot of cross-validation plot #634
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This is a quick fix to address #594.
In the end, I took a screenshot manually (by using the "Download plot as png" button of the Plotly widget) and displayed it with matplotlib.
Here are all the alternatives I considered, and what didn't work with them:
fig.write_image
, and the library that Plotly uses for this, Kaleido, is currently broken:plotly.write_image
fails to find Kaleido executable plotly/Kaleido#210fig.write_image