add some open graph protocol header stuff

tp/templates/base.html

@@ -4,6 +4,7 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
     <title>
+      {% block morehead %}{% endblock morehead %}
 
       {% url 'audio:home' as home_url %}
       {% url 'accounts:login' as login_url %}