The result is dugong. It’s a pretty simple library - no-frills, nice and small, with no dependencies on external libraries. Just download, plug into your webpage, and watch it convert lists to mind maps in front of your very eyes.
This is unlikely to become anything larger than it is right now - I could spend ages putting all kinds of fancy facilities into it, but I don’t feel like it’s a worth the hassle. Now go forth and outline.