docs: ignore panel css to increase main content width

[ianhi]

doc: ignore panel css to increase main content width

Otherwise the main content ends up being weirdly small
See:
https://github.com/executablebooks/sphinx-book-theme/blob/547cc95674623345124d9bbea9e15e5b5fa34d0e/docs/conf.py#L62
https://sphinx-panels.readthedocs.io/en/latest/index.html?highlight=panels_add_bootstrap_css#sphinx-configuration

Old:

New:

[redeboer]

Hey, cool, thanks for looking into this :)
Actually I played around a bit with this after I saw your commit mpl-extensions/mpl-interactions@2122a69. You spotted that well, I wasn't aware of that config from sphinx-panels!

I still have to think about this a bit though. I noticed that the pages of EPB projects all have this wider view, but I personally prefer to have texts less wide. It's for the same reason that newspapers (and many journals) write in columns: it's more convenient for reading. And if you prefer a wider view, you can collapse the left sidebar. (At the same time though, you could say readers should just make their window smaller if they prefer...)

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[redeboer]

I've this discussed your suggestion a bit in my group. They are in favour of a wider page width, so I'll merge this one. Thanks again for noting this!

To summarize:

• EPB uses this width as well.
• If you want a smaller page width, just make narrow your window.
• Many equations in AmpForm are quite wide, so a wider page width is more suitable.