TOC: extract h1/h2/h3, indent sub-levels in charte/licence sidebar

app/templates/public/charte.php

@@ -6,7 +6,7 @@
         <summary><?= icon('caret-down', 0, 'toc-caret') ?> PARTIES</summary>
         <ul class="toc-list">
             <?php foreach ($tocItems as $item): ?>
-            <li><a href="<?= htmlspecialchars($item['href']) ?>"><?= htmlspecialchars($item['label']) ?></a></li>
+            <li class="toc-level-<?= $item['level'] ?? 1 ?>"><a href="<?= htmlspecialchars($item['href']) ?>"><?= htmlspecialchars($item['label']) ?></a></li>
             <?php endforeach; ?>
         </ul>
     </details>