What tools for documenting the Generative Objects project?

As part of the efforts to open sourcing, it is essential that we write proper documentation.

The existing documentation is on Atlassian Confluence, of which I am not happy. Moreover, I would like that we use as much as possible open source software.

So what are your suggestions as what tool to use ?

It could be markdown documentation directly in github, but it seems too light for a project as big as Generative Objects.

I have been told about https://docusaurus.io that looks good.

Any suggestion on this topic ?