Update public/index.html

public/index.html

@@ -680,7 +680,7 @@
 
         <!-- Sonstiges --> 
      <!-- News & Veranstaltungen -->
-          <div class="col-lg-4 col-md-6 portfolio-item isotope-item filter-news">
+          <div class="col-lg-4 col-md-6 portfolio-item isotope-item filter-sonstiges">
             <div class="portfolio-content h-100">
               <div class="portfolio-info">
                 <h4>Abschlusstagung KNIGHT: Einladung & Programm</h4>