update vulnerable jquery-ui

https://snyk.io/vuln/npm:jquery-ui?lh=1.12.1&utm_source=lighthouse&utm_medium=ref&utm_campaign=audit

Author: PiRomant

templates/navigation.html

@@ -43,7 +43,7 @@
     </div>
 </nav>
 
-<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
+<script src="https://code.jquery.com/ui/1.13.1/jquery-ui.min.js"></script>
 
 <script>
     (function () {