the widget already has a heading, no seperate header needed

_includes/site-aside.html

@@ -10,7 +10,6 @@
       <p>{% include space-status.html %}</p>
       <h3> Chaotikum </h3>
       {% include vereinnavigation.html %}
-      <h3>Twitter</h3>
       {% twitter https://twitter.com/chaotikum_ev  maxwidth=500 limit=5 %}
     </section>
 
@@ -21,7 +20,6 @@
       <h3>Über uns</h3>
       <p>{{ site.description }}</p>
       {% include nav-social.html %}
-      <h3>Twitter</h3>
       {% twitter https://twitter.com/chaotikum_ev  maxwidth=500 limit=5 %}
     </section>