Add !nextevent

[tiffafoo]

Detailed Description

Responds with a facebook link and small description of the event as well

Context

There are a few ways to check the next event. This can be either via facebook or our docs. Adding the bot is a plus!

Possible Implementation

You can either check the latest facebook event by making a facebook api check of some sort, update the docs to be directly linked to all our events, having it manually set by a Firestarter, etc.