Added main nav to logged in pages

app/templates/views/api-keys.html

@@ -1,20 +1,17 @@
-{% extends "admin_template.html" %}
+{% extends "withnav_template.html" %}
 
 {% block page_title %}
 GOV.UK Notify | API keys and documentation
 {% endblock %}
 
-{% block content %}
+{% block maincolumn_content %}
 
-<div class="grid-row">
-	<div class="column-two-thirds">
 		<h1 class="heading-xlarge">API keys and documentation</h1>
 
 		<p>Here's where developers can access information about the API and access keys</p>
 
   	<p><a href="dashboard">Back to dashboard</a></p>
 
-	</div>
-</div>
+
 
 {% endblock %}