docs: Add AFM section

[manzt]

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[jtpio]

Landing here after the lightning talk by @MarcSkovMadsen at PyData Paris 2024 :)

Just wanted to say having some kind of "standard" for portable widget code would indeed be really useful 👍

For reference, a similar idea was discussed a few years ago at the Jupyter Widgets community workshop in London (jupyter-widgets/team-compass#16), which led to some experimentation in https://github.com/jupyterlab/richoutput-js.