More depth in the docs hierarchy

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What would be the easiest solution to implement a dropdown docs sidebar with more depth?
Like the example on the image. Best if it would work just by setting up a similar folder structure.

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You can use the getHeadings() function https://docs.astro.build/en/guides/integrations-guide/mdx/#getheadings it returns an object with a depth, slug, and text of each heading, then you can map over it to create a list of links like above