"Enforce HTTPS" option checked in GitHub Pages (not sure why this wasn't checked before, maybe it's a new feature?)
Some stylistic changes for blog posts:
Multiline code snippeds with dark background look okay, but is a little intrusive (decreases legibility) when there's dark background inline -- now prefer regular, non-colored <code> for inline snippets.
Footnotes changed from <sup> to <small> so that line spacing is correct.
Footnote section and post body delimited with <hr>s.
Custom styles added to <blockquote> and <kbd> tags.
Non-styled code blocks now not smaller than surrounding font. (Is true for styled code snippets.)