Is there an open source server (like rubydoc.info) for hosting documentation for private projects on rails?

Question

Ruby on Rails

I have several private projects and would like to make a centralized place with documentation on them (API description, deployment, configs, etc.).
Heroku is used as hosting. And given that there is a single dyno for free, it would be cool to use it for hosting documentation.
Of course, you can use the yard server, but then it turns out that for each project you need to configure your application in heroku and push changes to it.
Maybe there is an easier solution?