[FEATURE] Gif previews for examples about cursive

[gyscos]

Gif previews sounds like a great idea!

I would possibly aim for smaller pictures, so it's not too overwhelming when opening Readme.

I'd also look into storing the gif themselves in github LFS (should be far below the 1GB quota?), and cursive/examples/assets is a fine place for that.

I would also look into generating/updating these examples automatically. Maybe store in the same assets folders timed inputs for each example, and a script to replay these input and save the result in asciinema, before converting it to gifs.

My old record project might help there, though it doesn't seem to work at the moment (not sure how much work it'd take to fix it). Will look at alternatives.