feat: faster, support custom lib cdn and more standardized code style

layouts/404.html

@@ -1,3 +1,5 @@
+{{ define "title" }}{{ T "pageNotFound" }} | {{ .Site.Title }}{{ end -}}
+
 {{ define "content" }}
     <div class="notfound">
         <h1 class="error-emoji"></h1>
@@ -13,4 +15,4 @@
         var errorEmoji = emojiArray[Math.floor(Math.random() * emojiArray.length)];
         errorEmojiContainer.appendChild(document.createTextNode(errorEmoji));
     </script>
-{{ end }}
+{{ end }}