Sort inbox notifications into sections by repository

[SD10]

Hey everyone 👋,
Great work on this app, thank you for dedicating your free time 😉

I'd like to suggest a feature where the notifications in the Inbox are sorted by repository, similar to the notifications page on GitHub.

[rnystrom]

Ya!! I’ve been brainstorming a new control that drops down from the title so you can select a single repo.

Also lol, o.g. name

_{Sent with GitHawk}

[Sherlouk]

Definitely want this feature myself! Think the primary issue has always been how to "load more" when they're grouped? It wouldn't be completely obvious so that'd need to be worked out!

Closing in favor of keeping it in one issue though: #61