Puppet 3: Add overview of agent/master HTTPS comms

This came up in a puppet-users thread, and I had already done most of
the work necessary to lay this out. Only took about an hour to get down, so
I just went for it.
Puppet 3: Add the step where it fetches the node object
Puppet 3: Update with new info about unverified HTTPS requests

I checked it and was wrong: it only verifies the master's cert in
fully-verified connections.
Fixup: We don't have badges anymore, removing from Community menu
Fixit: Correcting or removing bad links.