This isn't self-hosted? I'm interested in a self-hosted solution that uses local markdown files and directories to manage content.
(disclaimer: I'm building something similar) Why is it every time something like Notion is mentioned, there is always someone who wants "local, self-hosted, Markdown"? Just build it yourself. This clearly shows you have no understanding of the product at hand. Notion is so incredibly powerful that Markdown doesn't even scratch the surface here.
The problem is that making a good interface is a though and long task. It's not done with crapping something together which then barfs out some file. That's people just can't build it themself, because it would be months and years to reach a good quality.
The demand for local&selfhosted on the other side is clear: people don't trust the companies. Companies peek into your data, sell them to other, or just disappear one day. With something under your control this will not happen.