feat: update impressum (#1046)

Author: Han2-Ro

src/pages/impressum.astro

@@ -12,10 +12,10 @@ import Layout from '@layouts/Layout.astro';
     <p>BIC: GENO DEM 1 GLS</p>
     <h2>Vorstand</h2>
     <ul>
+      <li>Annika Prevrhal</li>
+      <li>Lena Rother</li>
+      <li>Anton Prevrhal</li>
       <li>Rebecca Kresimon</li>
-      <li>Jakob Voigt</li>
-      <li>Emma Fernandez Schmidt</li>
-      <li>Jonas Bulik</li>
     </ul>
     <h2>Kontakt</h2>
     <dl>