Ansible setup for provisioning production web servers

What is covered by this PR:
* Provisioning and configuration of 2 cloud servers each in IAD and DFW + 1 cloud load balancer in DFW with the 4 cloud servers above as nodes.
* See `deploy/README.md` for details and usage instructions.

What is NOT covered by this PR:
* Elastic Search setup.
* 1-2 Jenkins builder (failover) in the regions for site build & deploy. **Question:** Can you expand on exactly what you mean by this? I'm unclear because I thought we already have a Jenkins instance somewhere.