Move server configs into a reusable module

modules/server.nix

@@ -0,0 +1,14 @@
+{ ... }:
+{
+  networking.networkmanager.enable = true;
+
+  users.users.nettika.openssh.authorizedKeys.keys = [
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHopty1QG8P+OfGxQ9CV0BI1IRB/q6yITzMZaZ6Zspid nettika@marauder"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIM8s5w9uAFMguVbbAamI7pKysgeLTwULXAVn5F0UDVl2 nettika@pixeltablet"
+  ];
+
+  services.openssh = {
+    enable = true;
+    settings.PasswordAuthentication = false;
+  };
+}