Feature Request: Click-and-drag to rearrange cells

[rljacobson]

Feature Request: An extension enabling click-and-drag to rearrange the order of cells in a notebook. The nteract notebook has this feature by default. Perhaps it's as easy as porting their code?

Not sure if I'm posting this in the right place. Thanks for your great work! I use it every day, and it dramatically improves Jupyter notebook ergonomics.