Currently in Gitea issue comments are not marked up with headings. I'm
trying to fix this by adding an appropriate
[ARIA](https://www.w3.org/WAI/standards-guidelines/aria/) role for
comment header and also by enclosing the comment itself in a semantical
article element.
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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>