Drag and drop headings?

I like a lot your tool, it helps me a lot navigating in markdown documents and makes noting/writing a lot more fun.

While using your tool, I was thinking that a drag-and-drop feature for headings would be very useful. More speicifically: i was thinking about a kind of 'shortcut'+'move with the mouse' feature, that rearranges the markdown order (and heading 'degree') according to a moving node.

If you want some help implementing it, or if other people would find this useful as well or know how to implement it, feel free to jump into the conversation!

The issue names no files, tests, or entry points. Start by locating the markdown heading rendering and mouse interaction code in the Atom package, then define how dragging changes heading order and level; done means headings can be rearranged with the proposed shortcut-and-mouse interaction.

Written by the indexing model from the issue text.