remark-math defaults to singleDollarTextMath: true, so any paragraph
containing two dollar amounts (e.g. "costs $120/mo (~$85 net)") has
the text between them parsed as inline TeX and rendered by KaTeX in an
italic math font, with ~ treated as a non-breaking space. Disable
single-dollar parsing in both web render paths, matching GitHub's
behavior; explicit $$...$$ math still renders.
Co-authored-by: Matt Voska <voska@users.noreply.github.com>
