Discovery feed: Photos from those followed by those you follow#617

Add a view which displays chorological feed of photos by the people followed by those you are following - but not including images from the people you follow (which are already in the main feed).

The idea is to help with exploration - this might be a good way of finding more art you enjoy and users to follow. There are good chances the people you have followed share a similar taste of art.

A further option might having on your own profile a “Following - extended” type of list of all the people who those you follow are following, ordered by most recent post. (I think in this view it would make sense to include also the ones you directly follow, as it’s easy to see from the profile image icon if you already follow them or not.)