Mac Feature request: Add `Move/copy feed to...` item(s) to feed(s) context menu

[amoeba]

Today I wanted to move a feed from one folder to another but I have a large enough number of feeds that I had to drag the feed down the sidebar for a while. This of course works but I've always found doing it kinda awkward. It would be super helpful if the feeds in the sidebar had a context menu item to move or copy the selected feed(s) to another folder.

PS: Thanks for building NetNewsWire, it's a joy to use.