feat: introduction of system_profiles

modules/default.nix

@@ -2,11 +2,16 @@
   imports = [
     ./accessibility.nix
     ./customisation.nix
+
+    # should only be imported directly or via system_profiles
+    #./dhcp-all-interfaces.nix
+
     ./environment.nix
     ./firewall.nix
     ./locale.nix
     ./networking.nix
-    #./plymouth.nix
+    #./plymouth.nix # increases boot time too much
+    #./serial-console.nix # probably only for servers
     ./theming.nix
   ];
 }

modules/dhcp-all-interfaces.nix

@@ -0,0 +1,9 @@
+{
+  # Enables DHCP on each ethernet and wireless interface.
+  # In case of scripted networking (the default) this is the recommended approach.
+  # When using systemd-networkd it's still possible to use this option,
+  # but it's recommended to use it in conjunction with
+  # explicit per-interface declarations with:
+  # `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+}