Merge CoverPhoto and ProjectLogo to use shared collection

[brylie]

Currently, we have separate collections for CoverPhoto and ProjectLogo. Determine how to merge the collections into a single collection, e.g. BrandingImages.

[jykae]

@brylie Putting this back to backlog, not that easy and important right now.

[bajiat]

@frenchbread Can you take this task, since you are familiar with FS collection?

[frenchbread]

@bajiat Ok.