added more user friendly welcome page

src/main/resources/templates/template.html

@@ -43,6 +43,7 @@
 					<a href="#" class="btn btn-outline-secondary" onclick="toggleDarkMode()"><i class="bi bi-moon"></i></a>
 				</li>
 				<li class="nav-item">
+					<a th:href="@{/logout}" class="btn btn-outline-secondary">⏼ Abmelden</a>
 					<a th:href="@{${nextcloudUrl}}" class="btn btn-outline-secondary">&#8594; nextcloud</a>
 				</li>
 			</ul>