Okay... Sixth and final version of the notifications view in #noStrudel

This one *finally* tracks what events have been read and lets you navigate the view using VIM or arrow keys.

I never bothered to make the app track the read / unread status of notifications because I thought it was just a nice-to-have feature.

But after I realized that the notifications should be treated more like an email inbox and not a timeline the read / unread status became very important