This is a request from one of our early adopter Forems. We should only
render the user count that appears on most of our sign up CTAs when a
Forem has a large userbase (initially, I'm setting that to 1000 users).
The change also removes a lot of duplicated markup by using some
partials to render the copy in the various auth CTAs.
Hopefully, this is written in such a way that changing opening up more
fine-grained control of these partials is trivial.
