add author/description/keywords in the head section
diff --git a/templates/article.html b/templates/article.html
index 52dc6a3..6c67492 100644
--- a/templates/article.html
+++ b/templates/article.html
@@ -1,5 +1,8 @@
{% extends "base.html" %}
-{% block title %}{{ SITENAME }} - {{ article.title }}{% endblock %}
+{% block head %}
+<meta name="keywords" content="{{ article.tags|join(', ') }}">
+{% endblock %}
+{% block title %}{{ article.title }}{% endblock %}
{% block header %}
Posted on {{ article.locale_date }}
{% endblock %}