Add missing RefArch undeployment section

_docs-sources/guides/reference-architecture/06-adding-a-new-account/05-deploy-the-ecs-deploy-runner.md

@@ -23,10 +23,14 @@ Deploy Runner:
 (cd <REPLACE_WITH_NAME_OF_ACCOUNT>/us-west-2/mgmt && terragrunt run-all apply)
 ```
 
-**NOTE:** Because this uses `run-all`, the command will not pause to show you the plan. If you wish to view the plan,
+:::note
+
+Because this uses `run-all`, the command will not pause to show you the plan. If you wish to view the plan,
 run `apply` in each subfolder of the `mgmt` folder, in dependency graph order. You can see the dependency graph by using
 the [graph-dependencies terragrunt
 command](https://terragrunt.gruntwork.io/docs/reference/cli-options/#graph-dependencies).
 
+:::
+
 At this point, the ECS Deploy Runner is provisioned in the new account, and you can start using the Gruntwork Pipeline
 to provision new infrastructure in the account.

_docs-sources/guides/reference-architecture/07-undeploy/05-undeploying-modules-using-gruntwork-pipelines.md

@@ -1,3 +1,34 @@
 # Undeploying modules using Gruntwork Pipelines
 
-...
+To destroy a module with no downstream dependencies, such as `route53-private` in the `dev` environment:
+
+1.  Update the `force_destroy` variable in `dev/us-west-2/dev/networking/route53-private/terragrunt.hcl`.
+    ([See the `force_destroy` section](./03-pre-requisite-force-destroy-on-s3-buckets.md).)
+
+        force_destroy = true
+
+1.  Open a pull request for that change and verify the plan in CI. You should see a trivial change to update the
+    module.
+1.  Go through the typical git workflow to get the change merged into the main branch.
+1.  As CI runs on the main branch, watch for the job to be held for approval. Approve the job, and wait for the
+    `deployment` step to complete so that the module is fully updated with the new variable.
+1.  Remove the module folder from the repo. For example:
+
+        rm -rf dev/us-west-2/dev/networking/route53-private
+
+1.  Open a pull request for that change and verify the plan in CI.
+    - Make sure the `plan -destroy` output looks accurate.
+    - If you are deleting multiple modules (e.g., in `dev`, `stage`, and `prod`) you should see multiple plan
+      outputs -- one per folder deleted. You'll need to scroll through the plan output to see all of them, as
+      it runs `plan -destroy` for each folder individually.
+1.  Go through the typical git workflow to get the change merged into the main branch.
+1.  As CI runs on the main branch, watch for the job to be held for approval. Approve the job, and wait for the
+    `deployment` step to complete so that the module is fully _deleted_.
+1.  [Remove the terraform state](./08-removing-the-terraform-state.md).
+
+:::note
+
+Repeat this process for upstream dependencies you may now want to destroy, always starting from the
+modules that have no existing downstream dependencies.
+
+:::

docs/guides/reference-architecture/06-adding-a-new-account/05-deploy-the-ecs-deploy-runner.md

@@ -23,15 +23,19 @@ Deploy Runner:
 (cd <REPLACE_WITH_NAME_OF_ACCOUNT>/us-west-2/mgmt && terragrunt run-all apply)
 ```
 
-**NOTE:** Because this uses `run-all`, the command will not pause to show you the plan. If you wish to view the plan,
+:::note
+
+Because this uses `run-all`, the command will not pause to show you the plan. If you wish to view the plan,
 run `apply` in each subfolder of the `mgmt` folder, in dependency graph order. You can see the dependency graph by using
 the [graph-dependencies terragrunt
 command](https://terragrunt.gruntwork.io/docs/reference/cli-options/#graph-dependencies).
 
+:::
+
 At this point, the ECS Deploy Runner is provisioned in the new account, and you can start using the Gruntwork Pipeline
 to provision new infrastructure in the account.
 
 
 <!-- ##DOCS-SOURCER-START
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docs/guides/reference-architecture/07-undeploy/05-undeploying-modules-using-gruntwork-pipelines.md

@@ -1,8 +1,39 @@
 # Undeploying modules using Gruntwork Pipelines
 
-...
+To destroy a module with no downstream dependencies, such as `route53-private` in the `dev` environment:
+
+1.  Update the `force_destroy` variable in `dev/us-west-2/dev/networking/route53-private/terragrunt.hcl`.
+    ([See the `force_destroy` section](./03-pre-requisite-force-destroy-on-s3-buckets.md).)
+
+        force_destroy = true
+
+1.  Open a pull request for that change and verify the plan in CI. You should see a trivial change to update the
+    module.
+1.  Go through the typical git workflow to get the change merged into the main branch.
+1.  As CI runs on the main branch, watch for the job to be held for approval. Approve the job, and wait for the
+    `deployment` step to complete so that the module is fully updated with the new variable.
+1.  Remove the module folder from the repo. For example:
+
+        rm -rf dev/us-west-2/dev/networking/route53-private
+
+1.  Open a pull request for that change and verify the plan in CI.
+    - Make sure the `plan -destroy` output looks accurate.
+    - If you are deleting multiple modules (e.g., in `dev`, `stage`, and `prod`) you should see multiple plan
+      outputs -- one per folder deleted. You'll need to scroll through the plan output to see all of them, as
+      it runs `plan -destroy` for each folder individually.
+1.  Go through the typical git workflow to get the change merged into the main branch.
+1.  As CI runs on the main branch, watch for the job to be held for approval. Approve the job, and wait for the
+    `deployment` step to complete so that the module is fully _deleted_.
+1.  [Remove the terraform state](./08-removing-the-terraform-state.md).
+
+:::note
+
+Repeat this process for upstream dependencies you may now want to destroy, always starting from the
+modules that have no existing downstream dependencies.
+
+:::
 
 
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