Relocate Starred and Watched repos

[smichel17]

On the My repositories screen, the Starred and Watched filter categories feel a bit out of place, since they alone are not subsets of All.

I think it would make sense to move Watched under Notifications, as its own tab (or possibly its own screen via a menu item). I seldom want to go look through the list of what I'm watching, unless I want to change that list -- in the context of notifications, and this mirrors the github interface, so we don't need to make people re-learn where it is.

Then, Starred can go under Bookmarks, which serves basically the same purpose, anyway. There could either be two tabs, or they could be in the same list, with bookmarks appearing on top.

[Tunous]

See #578 and #624

[maniac103]

Let's continue in #578 ... I'll copy your comment there.

[landry314]

But you never dealt with Watched...