Get rid of make-grid since it no longer has any callers

morph/lib/default.nix

 rec {
   hardware-aws = import ./issuer-aws.nix;
 
-  make-grid = import ./make-grid.nix;
-
   issuer = import ./issuer.nix;
   customize-issuer = import ./customize-issuer.nix;
 

morph/lib/make-grid.nix

-# Define a function for making a morph configuration for a storage grid.  It
-# takes two arguments.  A string like "Production" giving the name of the grid
-# and a function that takes the grid configuration as an argument and returns
-# a set of nodes specifying the addresses and NixOS configurations for each
-# server in the morph network.
-{ name, config, nodes }:
-let
-  pkgs = import <nixpkgs> { };
-  # Load our JSON configuration for later use.
-  cfg = pkgs.lib.trivial.importJSON config;
-in
-{
-  network =  {
-    # Make all of the hosts in this network use the nixpkgs we pinned above.
-    inherit pkgs;
-    # This is just for human consumption as far as I can tell.
-    description = "PrivateStorage.io ${name} Grid";
-  };
-} // (nodes cfg)