refactor: split server modules into smaller more manageable files

modules/nixos-modules/server/paperless/default.nix

@@ -0,0 +1,40 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  imports = [
+    ./proxy.nix
+    ./database.nix
+    ./fail2ban.nix
+    ./impermanence.nix
+  ];
+
+  options.services.paperless = {
+    subdomain = lib.mkOption {
+      type = lib.types.str;
+      description = "subdomain of base domain that paperless will be hosted at";
+      default = "paperless";
+    };
+    database = {
+      user = lib.mkOption {
+        type = lib.types.str;
+        description = "what is the user and database that we are going to use for paperless";
+        default = "paperless";
+      };
+    };
+  };
+
+  config = lib.mkIf config.services.paperless.enable {
+    services.paperless = {
+      domain = "${config.services.paperless.subdomain}.${config.host.reverse_proxy.hostname}";
+      configureTika = true;
+      settings = {
+        PAPERLESS_DBENGINE = "postgresql";
+        PAPERLESS_DBHOST = "/run/postgresql";
+        PAPERLESS_DBNAME = config.services.paperless.database.user;
+        PAPERLESS_DBUSER = config.services.paperless.database.user;
+      };
+    };
+  };
+}