Bump anchor.js from 4.3 to 5.0

Author: toshimaru

src/_layouts/default.html

@@ -70,7 +70,7 @@
 
   <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.min.js" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-Fy6S3B9q64WdZWQUiU+q4/2Lc9npb8tCaSX9FK7E8HnRr0Jz8D6OP9dO5Vg3Q9ct" crossorigin="anonymous"></script>
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/anchor-js/4.3.1/anchor.min.js" integrity="sha512-zPB79j2C+3sFS9zcA3vg/z6bVKzJVEyu9pY5w89akQRys76zpAT2t6S3wZKla3QQ14O5l/Yt0RUQ/DHXx82Y5g==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/anchor-js/5.0.0/anchor.min.js" integrity="sha512-byAcNWVEzFfu+tZItctr+WIMUJvpzT2kokkqcBq+VsrM3OrC5Aj9E2gh+hHpU0XNA3wDmX4sDbV5/nkhvTrj4w==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
   <script src="/assets/js/app.js"></script>
   <script src="/assets/js/search.js"></script>

src/assets/js/app.js

@@ -1,8 +1,9 @@
-$(() => {
-  // anchor-js
+document.addEventListener('DOMContentLoaded', (event) => {
   anchors.options.visible = 'always';
   anchors.add();
+});
 
+$(() => {
   // highlight.js
   hljs.configure({
     languages: ['ruby', 'html', 'bash', 'sql']