fix: add title to 404.html

Author: blackheaven

404.html

@@ -1,3 +1,6 @@
+---
+title: Page not found
+---
 <div class="max-w-screen-xl mx-auto py-16 md:py-24">
   $partial("templates/corners.html")$
   <div class="text-center pt-12 md:pt-20 px-12 sm:px-16 md:px-24 lg:px-36 ">