Perhaps, this has been covered already before, but I think it would be nice to see a list of all versions of a notebook, and not just the latest.
Simple list of slug versions when / is added to the notebook url with an option to preview each slug could do the trick.
For example, Leaflet Pixi Overlay / Taras Novak | Observable would show latest and prior notebook versions. Note the / at the end of that url.
