Reduce nodes

Currently, the terraform deploys RKE2 with 3 server nodes and 3 agent nodes across 3 availability zones. This is overkill for a small, simple production system. We should be able to deploy with 2 availability zones and have 2 servers and 2 agents as the desired state.

The benefit would be a quicker deployment and less costs. Availability zones rarely go down, so you still have the benefits of HA if it does.