Add the accounts page placeholder

This proves out that my navigation works the way that I want and that my
auto context variables are working. Currently we don't do much but say
they have no accounts, but we can build that up over time

templates/accounts.html

@@ -0,0 +1,7 @@
+{% extends 'layout.html' %}
+{% block main_content %}
+<h1>Accounts</h1>
+{% if not accounts %}
+<p>You don't have any accounts yet. Let's create some</p>
+{% endif %}
+{% endblock %}