Switching where the link goes is very simple (and should work now!).
On the other hand, changing where we get the images would take some work - with Gatherer we can just feed it a card name and get an image out, while Scryfall has a more complex/richer API. I feel like getting slightly nicer autocard images isn't incredibly valuable, though, since they need to be pretty small to avoid disrupting reading and navigation, and if you want a pretty image you can just... click the link.
So I probably won't do that part.