Demo image/video on main README missing

[pgleeson]

Was a good intro to the current functionality, and points to a file on Google drive, but it's not showing up.

[bendichter]

Thanks @pgleeson! Sometimes google drive is fails to send the gif. Now that GitHub supports gifs and videos internally, I think it would be better to just host them here, but it will require making the image smaller, since the current image is 22 MB and the current limit is 10 MB