Create brokers list page to mitigate pagination on overview

[ivpanda]

Problem: we saw a problem with the 'broker details' box (see below) in the console overview wherein if there were more than ten results, the user could not see them. We've added a temporary hotfix (also seen below) where we paginate the broker details box if there are more than ten brokers.

In future, what we should do is something like the following:

Show five at most, prioritizing first by status (if there are errors, these should show up first), and then by size. The rest of the brokers are then on another list page. According to Martin, there are "rarely more than 12. never seen more than 30."

[ivpanda]

Update: I need to design what this list page would look like, so this isn't ready to be picked up immediately. If someone wants to grab this, talk to me about a design.