removed docker.nix from global default.nix

systems/bob/default.nix

@@ -3,12 +3,13 @@
     ../../users/richie
     ../../common/global
     ../../common/optional/desktop.nix
+    ../../common/optional/docker.nix
     ../../common/optional/scanner.nix
     ../../common/optional/steam.nix
     ../../common/optional/syncthing_base.nix
     ../../common/optional/systemd-boot.nix
-    ../../common/optional/zerotier.nix
     ../../common/optional/yubikey.nix
+    ../../common/optional/zerotier.nix
     ./hardware.nix
     ./nvidia.nix
     ./syncthing.nix