Add sitemap and robots

src/layouts/MainHead.astro

@@ -33,6 +33,7 @@ const headDescription: string = description || site.description;
   <link rel="icon" type="image/png" href="/favicon.png" />
   <link rel="apple-touch-icon" href="/favicon.png" />
 
+  <link rel="sitemap" href="/sitemap-index.xml" />
   <SEO title={headTitle} description={headDescription} {image} />
 
   <ThemeManager defaultTheme="auto" />

src/pages/robots.txt.ts

@@ -0,0 +1,13 @@
+import type { APIRoute } from "astro";
+
+const getRobotsTxt = (sitemapURL: URL) => `\
+User-agent: *
+Allow: /
+
+Sitemap: ${sitemapURL.href}
+`;
+
+export const GET: APIRoute = ({ site }) => {
+  const sitemapURL = new URL("sitemap-index.xml", site);
+  return new Response(getRobotsTxt(sitemapURL));
+};