Use pages() function

Apparently this should restrict the results to "top level" pages (and be faster as a bonus!)

index.html

@@ -37,7 +37,7 @@
 			<div class="row">
 				<p><a href="{{ base_url }}">{{ site_title }}</a></p>
 				<ul class="nav">
-					{% for page in pages %}
+					{% for page in pages() %}
 					<li><a href="{{ page.url }}">{{ page.title }}</a></li>
 					{% endfor %}
 				</ul>