Introduce Simplified Reference Architecture

[osterman]

what

• Introduce an entirely new reference architecture
• Deprecate the previous architecture

why

• We've stopped practicing one repo-per AWS account because it makes GitOps incredibly difficult
• It's frequently better to have one repo per team, or business unit, or product, etc. Then all environments contained there in.
• We've moved from kops to EKS

references

• https://www.terraform.io/docs/cloud/workspaces/configurations.html#code-organization-and-repository-structure
• closes Document Account Deletion Gotcha #46, Adds featureGates to already templated services #48, Added support spotinst #51, Introduce Simplified Reference Architecture #54