HTML repr in the online docs

[shoyer]

I noticed two minor issues in our online docs, now that we've switched to the hip new HTML repr by default.

1. Most doc pages still show text, not HTML. I suspect this is a limitation of the IPython sphinx derictive we use for our snippets. We might be able to fix that by switching to jupyter-sphinx?

2. The "attributes" part of the HTML repr in our notebook examples looks a little funny, with strange blue formatting around each attribute name. It looks like part of the outer style of our docs is leaking into the HTML repr:
   

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[dcherian]

Most doc pages still show text, not HTML. I suspect this is a limitation of the IPython sphinx derictive we use for our snippets. We might be able to fix that by switching to jupyter-sphinx?

We can also switch from RST to MyST. It works quite well

I think the second point is fixed now.

[max-sixty]

Is the first point covered by #6620, albeit a more recent issue?