Allow users to give positive feedback about images

[sarahpearson]

The more "likes" (or whatever mechanism we use) an image has, the more that particular image gets shown to more people.

Idea is that this will help give positive reinforcement for high-quality/popular images.

[perpetuatingcuriosity]

Cool. We’ll need #318 for this.

“the more that particular image gets shown to more people”

That will probably come later one when we can sort the feed according to different criteria. Maybe there’s a dropdown where users can switch between different version of the feed, e.g.: “latest”, “trending”

[rheaplex]

#318 is now implemented. Please see that issue for details.