terraform: remove plugins without the opentofu prefix

terraform/README.md

@@ -39,3 +39,8 @@ Once the code is ready to be deployed, create a new PR with the attached
 output of `./tf.sh plan`.
 
 Once the PR is merged, run `./tf.sh apply` to apply the changes.
+
+## Upgrade from terraform to opentofu
+
+If you have used terraform, you may have to delete .terraform in this directory once
+to fixup provider registry addresses.

terraform/flake-module.nix

@@ -22,13 +22,6 @@ in
               p.netlify
               p.secret
             ]
-            ++ [
-              # FIXME: for our `terraform` target our state file still uses the old registry prefix
-              p.aws
-              p.fastly
-              p.netlify
-              p.secret
-            ]
           ))
         ];
       };