feat(configurations)!: flatten down, introduce meta.nix

Flatten down directory structure:
- From: `./hosts/${configuration-type}/${system}/{configuration,deploy}.nix`
-   To: `./hosts/${configuration-type}/{meta,configuration}.nix`
Keep `system` and `deploy-rs` config in `meta.nix`
Update `flake.lock`

hosts/nixos/jeeves/nginx.nix

@@ -0,0 +1,32 @@
+{ inputs, lib, pkgs, config, ... }:
+
+{
+  # age.secrets."nextcloud.adminpass" = {
+  #   rekeyFile = "${inputs.self}/secrets/home/jeeves/nextcloud/adminpass.age";
+  #   mode = "770";
+  #   owner = "nextcloud";
+  #   group = "nextcloud";
+  # };
+
+  environment.systemPackages = [
+    # config.services.nextcloud.package
+  ];
+
+  networking.firewall.allowedTCPPorts = [ 80 443 ];
+
+  services.nginx = {
+    enable = true;
+    package = pkgs.openresty;
+    # virtualHosts."_.${config.networking.hostName}.local" = {
+    #   # listen = [
+    #   #   {
+    #   #     addr = "127.0.0.1";
+    #   #     port = 1234;
+    #   #   }
+    #   # ];
+    #   enableACME = false;
+    #   forceSSL = false;
+    #   locations."/".proxyPass = "http://127.0.0.1:1234";
+    # };
+  };
+}