feat: polish demo

demo/nextjs/lib/metadata.ts

@@ -0,0 +1,28 @@
+import type { Metadata } from "next/types";
+
+export function createMetadata(override: Metadata): Metadata {
+	return {
+		...override,
+		openGraph: {
+			title: override.title ?? undefined,
+			description: override.description ?? undefined,
+			url: "https://demo.better-auth.com",
+			images: "https://demo.better-auth.com/og.png",
+			siteName: "Better Auth",
+			...override.openGraph,
+		},
+		twitter: {
+			card: "summary_large_image",
+			creator: "@beakcru",
+			title: override.title ?? undefined,
+			description: override.description ?? undefined,
+			images: "https://demo.better-auth.com/og.png",
+			...override.twitter,
+		},
+	};
+}
+
+export const baseUrl =
+	process.env.NODE_ENV === "development"
+		? new URL("http://localhost:3000")
+		: new URL(`https://${process.env.VERCEL_URL!}`);