Remove old unused images

[vikaspotluri123]

@peterkmt

An even better idea would be to add some kind of an image gallery to see what kind of content you have already with a flag showing if it’s used in a post and give the admin an option to remove it from the gallery. We’d be able to save some substantial amount of space on backups.

Sounds like this is something that could / would be implemented with Better image/file management & optimisation - #7 by chrisalley