refactor: moved nixos modules to dendrite pattern

modules/nixos/programs/paperless/paperless.nix

@@ -0,0 +1,29 @@
+{...}: {
+  flake.nixosModules.paperless-service = {
+    config,
+    lib,
+    ...
+  }: {
+    options.services.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 = {
+        configureTika = true;
+        settings = {
+          PAPERLESS_DBENGINE = "postgresql";
+          PAPERLESS_DBHOST = "/run/postgresql";
+          PAPERLESS_DBNAME = config.services.paperless.database.user;
+          PAPERLESS_DBUSER = config.services.paperless.database.user;
+        };
+      };
+    };
+  };
+}