Move dashboard into stackalytics

Installing a global module called dashboard is bad form as it
pollutes the global namespace.

Change-Id: I4b7ff8a4bbcb34a24f751d874c5f1894e75ae10c
Closes-Bug: #1320133

stackalytics/dashboard/templates/404.html

@@ -0,0 +1,12 @@
+{% block head %}
+    <meta http-equiv="refresh" content="5; url=/">
+{% endblock %}
+
+{% block body %}
+
+    <h2>404 Not Found</h2>
+
+    <div>The requested page is not found. The page will be automatically redirected to <a href="/">Main</a>
+    </div>
+
+{% endblock %}