remove aws and clean up arrow

modules/aws/default.nix

@@ -0,0 +1,15 @@
+{ ... }:
+{
+  config = {
+    # AWS settings require this
+    permitRootLogin = "prohibit-password";
+
+    # Make sure disk size is large enough
+    # https://github.com/nix-community/nixos-generators/issues/150
+    formatConfigs.amazon =
+      { config, ... }:
+      {
+        amazonImage.sizeMB = 16 * 1024;
+      };
+  };
+}