fixing series demo links

_includes/custom/getting_started_series.html

@@ -9,7 +9,7 @@
             <li class="active"> → {{p.title}}</li>
             {% else %}
             <li>
-                <a href="{{p.url}}">{{p.title}}</a>
+                <a href="{{p.url | remove: "/"}}">{{p.title}}</a>
             </li>
             {% endif %}
             {% endif %}