Update public/index.html

public/index.html

@@ -191,7 +191,7 @@
               <div class="col-lg-3 col-md-6 mb-lg-0 mb-5">
                   <!-- Insert Max's details here -->
                   <div class="avatar mx-auto">
-                      <img src="./imgs/avatar/Tatyana.jpg" class="rounded-circle z-depth-1" width="150px">
+                      <img src="https://www.hft-stuttgart.de/assets/hft_sitepackage/img/default-image.svg" class="rounded-circle z-depth-1" width="150px">
                     </div>
                     <h5 class="font-weight-bold mt-4 mb-3">Dr. Tatyana Podgayetskaya</h5>
                     <p class="text-uppercase blue-text"><strong>Academic staff member</strong></p>