Fix PAGES->pages for pelican 3.7.0

theme-fred/templates/base.html

@@ -34,7 +34,7 @@
     <footer>
         <nav>
             <ul>
-                {% for page in PAGES %}
+                {% for page in pages %}
                     <li><a href="{{ SITEURL }}/{{ page.url }}">{{ page.title }}</a>{% if not loop.last %} ::{% endif %}</li>
                 {% endfor %}
                 {% if categories|length > 1 %}