request - add an option to create custom feeds

I used Boost for Reddit and one of my favorite features was the ability to drag a select few subreddits into a custom list and name it.

So I would have a Gaming feed and could select that and only see subreddits for the 4-5 games I was following at that point.

With the fedeverse, I feel that would be even more useful as there's duplicate communities/magazines popping up.