Separate System and User packages

- Move user programs out of systems section and int
  user section
- Install user packages with home manager rather than
  system wide

system/security/firewall.nix

@@ -1,9 +1,9 @@
 { config, lib, pkgs, ... }:
 
 {
-  environment.systemPackages = [
-    pkgs.firewalld
-    pkgs.firewalld-gui
+  environment.systemPackages = with pkgs; [
+    firewalld
+    firewalld-gui
   ];
   networking.firewall.enable = true;
 }