Gifski requires at least 2 frames in the resulting GIF, but users might accidentally trim or choose low enough FPS for the resulting GIF to contain less than 2 frames. We should show a warning in the editor's view in that case.

Right now, we just show an error when the conversion starts:

<img width="472" alt="Screen Shot 2020-10-24 at 16 53 31" src="https://user-images.githubusercontent.com/

It would be great to have some backgrounds that are interactive just with the mousemove events, for example this demo or this one. Or even this one but with the mousemove instead of click.

The mosemove interactio