document learned lessons from steps

[tiny-dancer]

- terraform runner: prefer a single step where possible
    - reasons to expand: 
        - When it becomes burdensome for a single state file to handle the amount of resources
        - When it is easier to have explicit separation (e.g. configuring pagerduty or another third party service)
        - When a specific part of the step becomes a high churn area, it could be valuable to move it to own's step where that be developed on individually.