Make pages set description in head

templates/page.html

@@ -1,4 +1,12 @@
-{% extends "base.html" %} {% block content %}
+{% extends "base.html" %}
+
+{% block metadata %}
+
+<meta name="description">{{ page.description }}</meta>
+
+{% endblock %}
+
+{% block content %}
     <h3>{{ page.title }}</h3>
     <article>
         {% if page.date and page.date is defined %}