Refactor Terraform into components, remove deployment targets, add remote state tracking

[kharmabum]

Separate Terraform components (vpc vs services) and development environments, add remote state tracking

Example:

stage
  └ vpc
  └ services
      └ frontend-app
      └ backend-app
          └ vars.tf
          └ outputs.tf
          └ main.tf
          └ .terragrunt
  └ data-storage
      └ mysql
      └ redis
prod
  └ vpc
  └ services
      └ frontend-app
      └ backend-app
  └ data-storage
      └ mysql
      └ redis
mgmt
  └ vpc
  └ services
      └ bastion-host
      └ jenkins
global
  └ iam
  └ route53