Infra: Scroll on load with a sticky banner
This is basically @CAM-Gerlach's suggestion for how to resolve #3065, in the initial PR that introduced that functionality (#2992).
:books: Documentation preview :books:: https://pep-previews--3066.org.readthedocs.build/
Oh and just to note, I can reproduce the first problem, the one on my actual mobile browser, exactly the same on the production site as on this PR (as expected, given what's happening). The second problem, the one in the device simulator, I actually cannot reproduce on the live site, but as I cannot reproduce it on my actual Android Pixel 3a device, and it could come down to timing variations between the preview platform on RTD and the live site on GHP (though I do have heavy throttling on), it's not totally clear if that's a real issue or not.