[Docs Site] Fix sitemap filter (#23603)

Author: KianNH

astro.config.ts

@@ -167,10 +167,15 @@ export default defineConfig({
 		icon(),
 		sitemap({
 			filter(page) {
-				return (
-					!page.startsWith("https://developers.cloudflare.com/style-guide/") ||
-					!page.endsWith("/404/")
-				);
+				if (page.includes("/style-guide/")) {
+					return false;
+				}
+
+				if (page.endsWith("/404/")) {
+					return false;
+				}
+
+				return true;
 			},
 			serialize(item) {
 				item.lastmod = new Date().toISOString();