Sidebar table of contents

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While browsing meta, I saw this sidebar with contents.

I was wondering how this is generated? Is it a wiki? Is it a plug-in?

Is it created manually or automatically?

The image displays a screenshot of a webpage, showcasing various features and topics related to self-hosting and cloud computing. (Captioned by AI)
The image displays a screenshot of a webpage, showcasing various features and topics related to self-hosting and cloud computing. (Captioned by AI)1579×1212 160 KB

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