[+] add: 404 Page

i18n/en.toml

@@ -0,0 +1,4 @@
+[404-text]
+other = "404 Not Found."
+[404-link]
+other = "Go Back"

i18n/zh-CN.toml

@@ -0,0 +1,4 @@
+[404-text]
+other = "文件找不到了。"
+[404-link]
+other = "返回"

layouts/404.html

@@ -0,0 +1,11 @@
+{{ define "main" }}
+<div class="post">
+  <h1 class="post-title">404!</h1>
+
+  <div class="post-content">
+    {{ i18n "404-text" }}<br>
+    <a href="{{ "/" | absURL }}">{{ i18n "404-link" }}&nbsp;→</a>
+  </div>
+
+</div>
+{{ end }}