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

node_modules/next/dist/server/route-definitions/app-page-route-definition.d.ts

@@ -0,0 +1,9 @@
+import type { RouteDefinition } from './route-definition';
+import { RouteKind } from '../route-kind';
+export interface AppPageRouteDefinition extends RouteDefinition<RouteKind.APP_PAGE> {
+    readonly appPaths: ReadonlyArray<string>;
+}
+/**
+ * Returns true if the given definition is an App Page route definition.
+ */
+export declare function isAppPageRouteDefinition(definition: RouteDefinition): definition is AppPageRouteDefinition;