Include nvd if we're going to actually use it

home/modules/baseline/xonsh_footer.xsh

@@ -65,7 +65,6 @@ def _rebuild(args):
     else:
         with TemporaryDirectory() as td:
             pushd @(td)
-            import platform
             nom build f"/etc/nixos#nixosConfigurations.{hostname}.config.system.build.toplevel"
             if g`result`:
                 nvd diff /run/current-system result

modules/baseline.nix

@@ -100,6 +100,7 @@ in
     killall
     nano
     nix-output-monitor
+    nvd
     pciutils
     pwgen
     unzip