While I’m really impressed with the Eisvogel template for my Org->PDF toolchain—the rendered listings remember me of the Nord theme that I use in my terminal and under Emacs or Vim), I’m also investigating other alternatives. Here are is a nice candidate: arabica, but that may well be too much for what I need. And I learned that there already was some attempt at generating pretty HTML book via Pandoc/Jekyll before Hadley Wickham Advanced R.