update: system update & refactor

# Breaking Changes
- sops location movod to "system/dev/<dev-name>/sops/sops-conf.nix"
- flake devices declaration changes
- whole flake update

system/dev/dn-server/networking.nix

@@ -1,19 +0,0 @@
-{ lib, ... }:
-with lib;
-{
-  networking = {
-    domain = "net.dn";
-    networkmanager = {
-      enable = true;
-      insertNameservers = mkForce [ "127.0.0.1" ];
-    };
-    enableIPv6 = true;
-    firewall = {
-      enable = true;
-      allowedTCPPorts = [
-        443
-        80
-      ];
-    };
-  };
-}