We've been working on this for a little while, but it's finally ready for public use! We now have a dedicated documentation site, available at:
Huge thanks to @fulldecent who headed up the initiative and set everything up. It's hosted on GitHub Pages, which means it's easy to update (using Markdown), and anyone can contribute. So far it's almost identical to the current documentation, but it's been reorganised a little and we also added syntax highlighting.
If you spot any errors, post here or start an Issue in the repository, or submit a pull request. The README also has instructions for setting up Jekyll on your machine if you want to test changes.
There's lots more I want to add in the future. More documentation on certain functions and variables would be great (e.g. the form array structure or $qa_content).
Let me know your thoughts and ideas!