Punct is a programming environment for publishing things, implemented in Racket. It uses inline Racket code to extend CommonMark-flavored Markdown, which is parsed into a format-independent AST that can be rendered in HTML (or any other target file type).
Documentation is at https://joeldueck.com/what-about/punct/.
Clone this repository, and from within the checkout’s root folder, do raco pkg install --link punct-lib/ punct-doc/ (note the trailing slashes).
Once this is done, try it out by following along with the Quick Start.