dark mode and light mode in the display of the credentials

[Sakurann]

@leecam pointed out that it would be nice to have a dark and light versions for any images or colors specified in the display object of a credential. Is there support to add this functionality? one way to do this might be to have two objects with type light and dark (need to make sure it is backward compatible)

[ThierryThevenet]

On our side if the specs were implemented we would use them (display with background images)

[Sakurann]

need to confirm that this can be done in a backward compatible manner, but since this feature is not likely be mandatory, tackling it post 1.0 should be acceptable.