add date

Author: despadam

_includes/news.html

@@ -2,7 +2,7 @@
   <div class="container mb-3">
     <h1 class="mt-5 mb-5">Latest News</h1>
     <h2>SciCatCon 2026</h2>
-    <h3>Save the date</h3>
+    <h4>Save the date: 30 June - 2 July 2026</h4>
     <p class="news-title">
       SciCatCon 2026 will be hosted at MLZ close to Munich, Germany.
     </p>