Replace help link

src/containers/LoginPage.js

@@ -30,12 +30,13 @@ function LoginPage() {
                 Create a new account
               </a>
             </ListGroupItem>
-            <ListGroupItem header="I need further assistance">
-              Please contact the{' '}
-              <a href="http://www.esrf.eu/UsersAndScience/UserGuide/Contacts">
-                User Office
-              </a>
-            </ListGroupItem>
+            <li class="list-group-item">
+              <h4 class="list-group-item-heading">
+                <a href="mailto:dataportal-feedback@esrf.fr">
+                  I need further assistance
+                </a>
+              </h4>
+            </li>
             <ListGroupItem bsStyle="warning" header="Important note">
               During 2019 and according to the General Data Protection
               Regulation, all portal users who did not consent to the{' '}