Python layout.images docs

[jackparmer]

Here are some ideas to make the image examples more useful, interesting, or inspiring: https://plot.ly/python/images/

1. For background image, maybe something like this instead of the python logo: https://matplotlib.org/users/image_tutorial.html

2. For the multiple images example, maybe chemical structures with spectroscopy data?

3. Heard of a few folks using image backgrounds with Datashader for plots with too much data to be interactive:

https://moderndata.plot.ly/visualize-100-million-points-with-datashader-and-plotly/

4. Might be fun to do something with facial recognition overlays and hover text:

[michaelbabyn]

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