Improve overall new examples' accessibility #33772
Merged
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Small tweaks caught by Pa11y on Boosted. Mostly:
main
andh1
on each page,input
missing a label,alt
onimg
inside a link,I ignore some other errors since they're not applicable for such snippets IMHO (several banner roles instead of one, for example).
Non-whitespace diff: https://github.com/twbs/bootstrap/pull/33772/files?w=1