Show survey link only if user is not referred from odsh site

ckanext/odsh/templates/page.html

@@ -21,6 +21,7 @@
     {% block flash %}
     {{ super() }}
 
+    {% if not request.referrer or not request.referrer.startswith(h.odsh_public_url()) %}
     <div class="alert alert-info" role="alert">
 
       <button type="button" class="close" data-dismiss="alert" aria-label="Close">
@@ -34,6 +35,8 @@
       </p>
      
     </div>
+    {% endif %}
+
     {% endblock %}
 
     {% block toolbar %}