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-pre7780/nginx.nix

@@ -1,31 +0,0 @@
-{ config, ... }:
-{
-  networking.firewall.allowedTCPPorts = [
-    443
-    80
-  ];
-
-  security.acme = {
-    acceptTerms = true;
-    defaults = {
-      validMinDays = 2;
-      server = "https://ca.net.dn/acme/acme/directory";
-      renewInterval = "daily";
-      email = "danny@net.dn";
-      dnsProvider = "pdns";
-      dnsPropagationCheck = false;
-      environmentFile = config.sops.secrets."acme/pdns".path;
-    };
-  };
-
-  users.users.nginx.extraGroups = [ "acme" ];
-
-  services.nginx = {
-    enable = true;
-    enableReload = true;
-    recommendedGzipSettings = true;
-    recommendedOptimisation = true;
-    recommendedTlsSettings = true;
-    recommendedProxySettings = true;
-  };
-}