Migrate state from cloud over to s3

When you try to do it out of the box, you get this error:

```
Initializing the backend...
Migrating from Terraform Cloud to s3 state.
╷
│ Error: Migrating state from Terraform Cloud to another backend is not yet implemented.
│
│ Please use the API to do this: https://www.terraform.io/docs/cloud/api/state-versions.html
```
The instructions on that page are not every helpful.

Luckily this fine fellow on the internet tells us how to do it here:
https://nedinthecloud.com/2022/03/03/migrating-state-data-off-terraform-cloud/

tl;dr is to do this:
1. `terraform init` with the cloud provider
2. `mkdir -p terraform.tfstate.d/tfc-migration-test`
3. `terraform state pull > terraform.tfstate.d/production-tier1/terraform.tfstate`
4. `mv .terraform/terraform.tfstate .terraform/terraform.tfstate.old`
5. Drop the cloud section of the terraform provider and replace it with
   s3
6. `terraform init`

tf/environments/production/main.tf

@@ -1,18 +1,18 @@
 # Store terraform state in s3
 terraform {
-  #backend "s3" {
-  #  bucket = "ooni-secrets"
-  #  key    = "terraform/production/terraform-production.tfstate"
-  #  region = "eu-central-1"
-  #}
-
-  cloud {
-      organization = "ooni"
-      workspaces {
-          name = "production-tier1"
-      }
+  backend "s3" {
+    bucket = "ooni-secrets"
+    key    = "terraform/production/terraform-production.tfstate"
+    region = "eu-central-1"
   }
 
+  #cloud {
+  #    organization = "ooni"
+  #    workspaces {
+  #        name = "production-tier1"
+  #    }
+  #}
+
 }
 
 provider "aws" {