change wording in 404 page

zamronypj · zamronypj · commit 5ef9d4dd7770 · 2018-11-08T19:17:21.000+08:00
diff --git a/404.md b/404.md
@@ -1,10 +1,11 @@
 ---
 # example 404.md
 
+title: Page not found
 layout: contentsidebar
 permalink: /404.html
 ---
 
-# 404
+# Not found
 
-Page not found! :(
+Sorry, the page you are looking is not found.
