refactor file structure

hosts/radish/configuration.nix

@@ -0,0 +1,39 @@
+{ ... }:
+{
+  nix = {
+    settings = {
+      experimental-features = [ "nix-command" "flakes" ];
+      auto-optimise-store = true;
+    };
+
+    gc = {
+      automatic = true;
+      dates = "daily";
+      options = "--delete-older-than 7d";
+    };
+  };
+
+  networking.extraHosts = ''
+    10.10.0.1 warden.apu.repomaa.com
+  '';
+
+  networking.nftables.enable = true;
+
+  # This option defines the first version of NixOS you have installed on this particular machine,
+  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
+  #
+  # Most users should NEVER change this value after the initial install, for any reason,
+  # even if you've upgraded your system to a new NixOS release.
+  #
+  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
+  # so changing it will NOT upgrade your system.
+  #
+  # This value being lower than the current NixOS release does NOT mean your system is
+  # out of date, out of support, or vulnerable.
+  #
+  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
+  # and migrated your data accordingly.
+  #
+  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
+  system.stateVersion = "23.11"; # Did you read the comment?
+}