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/system.nix

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