Make the robots.txt file dynamic in order to pull domain from config.

Author: rnwolf

public/robots.txt

@@ -0,0 +1,15 @@
+import type { APIRoute } from 'astro';
+
+const getRobotsTxt = (sitemapURL: URL) => `
+User-agent: *
+Allow: /
+
+Disallow: /api/*
+
+Sitemap: ${sitemapURL.href}
+`;
+
+export const GET: APIRoute = ({ site }) => {
+  const sitemapURL = new URL('sitemap-index.xml', site);
+  return new Response(getRobotsTxt(sitemapURL));
+};