ghost/admin/public/assets/icons/sidemenu-open.svg
<svg width="24" height="24" fill="none" xmlns="http://www.w3.org/2000/svg">
<title>sidemenu-open</title>
<path d="M21 2.5H3c-.828 0-1.5.608-1.5 1.357v16.286c0 .75.672 1.357 1.5 1.357h18c.828 0 1.5-.608 1.5-1.357V3.857c0-.75-.672-1.357-1.5-1.357zM16.5 2.5v19" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M16.5 2.5v19h6v-19h-6z" fill="#15171A"/>
</svg>