Some events ideas

[zardus]

Opening this PR to explore some ideas around more social involvement. This implements a http://localhost.pwn.college/pwncollege_api/v1/events endpoint that shows recent emojis, belts, solves, and container launches (out of running containers). I figure a frontend component would repeatedly request this, filter out things it'd already displayed, and display stuff up in navbar or something.

Some problems:

1. There's probably a much more correct way to do this web-wise. We could have events get queued by the backend when something event-worthy happens (solve, belt assignment, etc), put it in some queue in redis, and distribute it properly from there.
2. The query takes 35 seconds on my desktop, which means the server has no chance. I think it's mostly the stupid solves.