add login/sign-up page with dark/light mode

node_modules/next/dist/server/lib/module-loader/node-module-loader.d.ts

@@ -0,0 +1,7 @@
+import type { ModuleLoader } from './module-loader';
+/**
+ * Loads a module using `await require(id)`.
+ */
+export declare class NodeModuleLoader implements ModuleLoader {
+    load<M>(id: string): Promise<M>;
+}