Top-level Only
Drops subsections when the index would crowd.
<TableOfContents hideSubItems>
<TableOfContents.Item id="overview">Overview</TableOfContents.Item>
<TableOfContents.Item id="basic-usage" indent>Basic usage</TableOfContents.Item>
<TableOfContents.Item id="advanced-usage" indent>Advanced usage</TableOfContents.Item>
<TableOfContents.Item id="accessibility">Accessibility</TableOfContents.Item>
</TableOfContents>