MAINT: various fixes to print CSS.

[Carreau]

This should among other fix #1745

When printing this hides

• The pydata navbar
• The announcement banner.
• The "skip to main content" link.
• The location breadcrumbs (in bd-header-article), without also hiding the container the full content is shifted by a dozen pixel hight and the end of the content get hidden behind the footer when printing.
• The prev.next buttons a bottom of page.

This does not hide the version warning banner as this is currently being worked on in another PR.

I went the route of adding the bootstrap d-print-none, instead of adding custom css rules, I'm happy to do the opposite, but it seem the using bootstrap classes as that seems what is done in other places.

I've also added a break-inside avoid in a few places, mostly to try-to avoid page breaks in the middle of codeblocks.

[drammock]

hmm the defusedxml errors should have been fixed by #1751 ... Oh I see, there's been a sphinx release so now all test runners need it, not just the one running sphinx dev

I'll open another PR to fix that

[trallard]

Merged main to resolve some conflicts. @gabalafou, since you have already reviewed it, feel free to merge the PR once the CI is completed.

[Carreau]

Thanks !