Previews for image assets in diff views

[lucasderraugh]

GitUp doesn't show previews for image assets. We should show some kind of preview of the asset to give better context of what is being added or removed.

[lolgear]

@lucasderraugh How to show removed images?

[lucasderraugh]

If my understanding of git is correct, the image isn’t removed if it was previously committed, unless you go in and explicitly rewrite history.