Update public/index.html

public/index.html

@@ -315,7 +315,7 @@
                    <!-- Tim -->
             <div class="col-lg-3 col-md-6 mb-lg-0 mb-5">
                     <div class="avatar mx-auto">
-                      <img src="https://profile-images.xing.com/images/6673f8ac7a1d8378463c69c2d408e5ef-1/tim-herbst.256x256.jpg" class="rounded-circle z-depth-1" width="150px">
+                      <img src="imgs/grey_dot.png" class="rounded-circle z-depth-1" width="150px">
                     </div>
                     <h5 class="font-weight-bold mt-4 mb-3">Tim Herbst</h5>
                     <p class="text-uppercase blue-text"><strong>Software Engineer</strong></p>