Add createLecture for orga only

Co-Authored-By: andibuls <andibuls@users.noreply.github.com>
Co-Authored-By: tomvahl <tomvahl@users.noreply.github.com>
Co-Authored-By: Lukas Ettel <lukasettel@users.noreply.github.com>

src/main/resources/templates/index.html

@@ -21,6 +21,10 @@
                 <li>
                     <a th:href="@{/gruppen2/findGroup}" href="/findGroup">Suche</a>
                 </li>
+                <!-- Fix double point -->
+                <li th:if="${account.getRoles().contains('orga')}">
+                    <a th:href="@{/gruppen2/createLecture}" href="/createLecture">Veranstaltung</a>
+                </li>
             </ul>
         </nav>
 </header>