For general installation and configuration look at the components package.
<!-- index.html -->
...
<body>
<div class="db-accordion">
<details class="db-accordion-item">
<summary>Title 1</summary>
<div>Content 1</div>
</details>
<details class="db-accordion-item">
<summary>Title 2</summary>
<div>Content 2</div>
</details>
<details class="db-accordion-item">
<summary>Title 3</summary>
<div>Content 3</div>
</details>
</div>
</body>