Update footer-custom.html

Author: axel-lauer

_includes/footer-custom.html

@@ -23,8 +23,7 @@
     <th>Acknowledgements</th>
   </tr>
   <tr>
-     <td><p style="font-size:95%;">📧 <a href="javascript:mail('birgit.hassler','dlr.de')">Birgit Hassler (Project Co-PI)</a><br>
-        📧 <a href="javascript:mail('axel.lauer','dlr.de')">Axel Lauer (Core Developer)</a><br></p></td>
+     <td><p style="font-size:95%;">📧 <a href="javascript:mail('birgit.hassler','dlr.de')">Birgit Hassler (Project Co-PI)</a><br></p></td>
     <td><p style="font-size:95%;"><a href="/legal_notice">Legal Notice</a></p></td>
     <td><p style="font-size:95%;"><a href="/privacy">Privacy Notice</a></p></td>
     <td><p style="font-size:95%;"><a href="/terms_of_use">Terms of use</a></p></td>