Reflect: group users into rooms

[xpaczka]

As stated by reflect team, we should have 50 users in one room at most and right now we are only running one room for all of our users. We have to split them into different rooms, so we stop getting the issues we have now.

They have a new library that help with organizing people into different room, based on set max capacity:
https://github.com/rocicorp/reflect-orchestrator