It's an ok score :p
I'm in the process of putting together my post-mortem article (which will be up at my blog when I'm done), but the short answer is "I used cl-notebook and parenscript". The first is a notebook-style editor for Common Lisp (for which I'm in the process of writing an `itch.io` exporter), and the second is a library that provides a CL->JS transformation for an extended subset of the language.