nixfmt-rfc-style

There is nothing in this commit except for the changes made by
nix-shell -p nixfmt-rfc-style --run "nixfmt ."

If this has mucked up your open branches then sorry about that. You
can probably nixfmt them to match before merging

examples/hello-from-mt300.nix

@@ -1,8 +1,9 @@
-{ config, pkgs, ... } :
+{ config, pkgs, ... }:
 let
   svc = config.system.service;
 
-in rec {
+in
+rec {
   imports = [
     ../modules/network
     ../modules/ssh