refactor: overhaul pretty much all the organization

modules/options.nix

@@ -0,0 +1,19 @@
+{ lib, ... }:
+{
+  domain = lib.mkOption {
+    type = lib.types.str;
+    description = "The domain name the server is hosted on.";
+  };
+
+  https = lib.mkOption {
+    type = lib.types.boolByOr;
+    default = true;
+    description = "Whether to force HTTPS connections for websites.";
+  };
+
+  acmeEmail = lib.mkOption {
+    type = lib.types.str;
+    default = "";
+    description = "Email address for ACME.";
+  };
+}