feat : add sitemao and some SEO

app/sitemap.ts

@@ -0,0 +1,17 @@
+import type { MetadataRoute } from "next";
+import { connection } from "next/server";
+
+import { getCachedPublicGuideCards } from "@/lib/cache/public";
+import { siteUrl } from "@/lib/site-url";
+
+export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
+  await connection();
+  const guides = await getCachedPublicGuideCards();
+
+  return [
+    { url: siteUrl },
+    ...guides.map((guide) => ({
+      url: `${siteUrl}/${encodeURIComponent(guide.slug)}`,
+    })),
+  ];
+}