Fix making of "sources.html"

Uses same template as synopsis, maybe this shoudl be generalised a bit

doc/synopsis/template.html

@@ -32,7 +32,6 @@ $endfor$
 <div class="row">
 
   <nav class="col-md-3 col-xl-2 d-none d-md-block sidebar" id="quicklinks">
-    <h5>Quick links</h5>
     <!-- filled dynamically via quicklinks.js -->
   </nav>