modules: system: printing: move from 'profiles'

This isn't really a cross-cutting module, it should be a module rather
than a profile.

hosts/nixos/aramis/default.nix

@@ -15,6 +15,7 @@
     ./secrets
     ./services.nix
     ./sound.nix
+    ./system.nix
   ];
 
   # Set your time zone.

hosts/nixos/aramis/profiles.nix

@@ -9,8 +9,6 @@
     gtk.enable = true;
     # Laptop specific configuration
     laptop.enable = true;
-    # Printers are hell, but so is the unability to print
-    printing.enable = true;
     # i3 configuration
     wm.windowManager = "i3";
     # X configuration

hosts/nixos/aramis/system.nix

@@ -0,0 +1,10 @@
+# Core system configuration
+{ ... }:
+{
+  my.system = {
+    # Printers are hell, but so is the unability to print
+    printing = {
+      enable = true;
+    };
+  };
+}