configuration: extract nixos config into more files

system/network.nix

@@ -0,0 +1,24 @@
+{ pkgs, ... }: {
+  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+  # Configure network proxy if necessary
+  # networking.proxy.default = "http://user:password@proxy:port/";
+  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
+  # Enable networking
+  networking.networkmanager.enable = true;
+  # Open kde connect ports
+  programs.kdeconnect.enable = true;
+
+  # Enable CUPS to print documents.
+  # services.printing.enable = true;
+
+  security.rtkit.enable = true;
+  services.openssh = {
+    enable = true;
+    ports = [ 9022 ];
+    settings = {
+      PermitRootLogin = "no";
+      PasswordAuthentication = false;
+      KbdInteractiveAuthentication = false;
+    };
+  };
+}