Plus the nixpkgs and nixos docs are generated from some weird hybrid docbook-markdown that mere mortals (well me at least) can't get to build. So we are stuck using the makes-my-eyes-bleed font on nixos.org, and the gigantic mile-long single-page manual format (which is nice sometimes, like for searching, but other times you want a TOC sidebar).

The documentation for the nix language is all done in mdbook, and is beautiful and easy to read. I wish the nixpkgs/nixos manuals were like that.