Services, refactor, clean up, service to automatic

Move service to automatic since it has a separate purpose.

Refactor the default.nix code to include service.nix files so it is
easier to extend code.

nixosModules/default.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     ./apps
+    ./automatic
     ./services
   ];
 }