Delete media from storage that was remove on presentation editions #7
Description
When updating a presentation, users have the possibility of adding or removing media. The problem is when the removing action is performed, the API doesn't remove the old media stored in the presentation specific storage inside each Liquid Galaxy screen.
The task is to update the API to when a media is no more referred in the presentation object, delete it from the storage. This action needs to be done when the UPDATE endpoint is called.