I'm sorry, you've held off on publishing on github due to missing source code highlighting? Or am I completely misunderstanding what you're saying (I think I am...)?
Admittedly I haven't checked recently, but before I released 2 Ton Digital I did a few test github projects and they all looked horrific so yeah I left it out on purpose. It's been on my "someday when I am bored" list since then (to fix up linguist so it all looks half-decent), and also why all the "library as HTML" on 2ton.com.au is self-highlighted.