actuel-inactuel/site/snippets/toc.php

<nav class="toc">
    <div class="light toc_label">Sommaire</div>
    <ul>
        <?php foreach ($page->tocItems() as $item): ?>
        <li><a href="#<?= $item['slug'] ?>"><?= $item['title'] ?></a></li>
        <?php endforeach ?>
    </ul>
</nav>