Add WCCM call to banner (#642)

Author: MakisH

_includes/news_banner.html

@@ -2,14 +2,14 @@
 {% else %}
 {% endif %}
 
-{% if false %}
+{% if include.onlanding %}
 
 <aside role="banner" class="background-light banner-container">
   <div class="container">
     <div class="row no-margin">
       <div class="col-lg-12 banner">
         <p class="no-margin">
-          It's happening: <a href="precice-workshop-2025.html">preCICE Workshop 2025, Hamburg, Sep 8-12 </a>
+          Submit your abstract to the preCICE session at <a href="eccomas-wccm-2026.html">WCCM 2026</a> (Munich, July 19-24)
         </p>
       </div>
     </div>