A nicer 404

404.html

+---
+layout: default
+title: Page not found
+permalink: /404
+nav_exclude: true
+search_exclude: true
+---
+
+<h1>Page not found</h1>
+
+<p>The page you requested could not be found. Try using the navigation {% if site.search_enabled %}or search {% endif %}to find what you're looking for or go to this <a href="{{ site.url }}{{ site.baseurl }}">site's home page</a>.</p>