Adds a 404 page. (#38)

pinaxcon/templates/404.html

@@ -0,0 +1,23 @@
+{% extends "site_base_wagtail.html" %}
+{% load staticfiles %}
+{% load wagtailcore_tags %}
+
+{% load sitetree %}
+{% load i18n %}
+
+{% block body_class %}template-blogpage{% endblock %}
+
+{% block head_title %}{{ page.title }}{% endblock %}
+
+{% block body %}
+  {% block content %}
+    {% include "cms_pages/content_page_header_panel.html" %}
+    <div class="l-content-page">
+      <div class="l-content-page--richtext">
+        <h2>Ooops</h2>
+
+        <p>The page you're looking for doesn't exist. Sorry!</p>
+      </div>
+    </div>
+  {% endblock %}
+{% endblock %}