title: Ionic v6 Ion-accordion open first item by default
body: <p>We upgraded our app from v5 to v6, we have a page where we are displaying expandable items and we thought we would make use of the newly introduced <code>ion-accordion</code>, the problem is on page load all the items are collapsed, I want the first item expanded while all the other items are closed. Are there any attributes I can set on <code>ion-accordion</code> to achieve this?</p>