Update index.html

Author: nheider

docs/index.html

@@ -199,7 +199,7 @@ <h2 class="title is-3">Contribute a Dataset</h2>
           <p>Are you a researcher with a high-quality agricultural computer vision dataset? We welcome contributions to our catalogue!</p>
           <p>If you would like to have your dataset considered for inclusion in this collection, please contact us via:</p>
           <ul>
-            <li>Email: <a href="mailto:heider@wifa.uni-leipzig.de">heider@wifa.uni-leipzig.de</a></li>
+            <li>E-mail</li>
             <li>GitHub: <a href="https://github.com/SmartFarmingLab/field_dataset_survey/issues" target="_blank">Open an Issue</a></li>
           </ul>
         </div>