Modifying docs on an Open Source project

So, I've never really messed around with the docs part of Next, and I'm trying to understand how things working looking at https://github.com/vercel-labs/ai
I think I lack fundamental understanding of building tools/libraries like this, so my question is: I cloned the repository and ran it as dev, but then I realized I have no idea on how to, or even if possible, to access the documentation locally. I tried
localhost:3000/docs
but it's a 404

Like I said, I lack understanding of this, but if anyone could help me see what I'm doing wrong, it'd help
GitHub
Build AI-powered applications with React, Svelte, and Vue - GitHub - vercel-labs/ai: Build AI-powered applications with React, Svelte, and Vue
GitHub - vercel-labs/ai: Build AI-powered applications with React, ...
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