The html_document_clean() template now sets a few fallback CSS rules
before loading the framework's CSS bundle. This should make the CSS
more consistent with each framework but also patch gaps where the
default body styles aren't quite what's expected (thanks @Jeevun #36, #37).
Updated all CSS bundles to their latest versions.
cleanrmd now bundles the Libertinus font for latex.css (thanks @edarin #35).
The html_document_clean() format now supports toc-title when passed as a
top-level YAML argument or as a pandoc argument (#30).