You can use GitHub for documentation. Write the files using Markdown, patch them together with a simple table of contents like this one, and use GitHub to publish your documentation as a website.
This guide doesn't hide from things like using git on the command line, but it does try to hold
your hand every step of the way.
The typical workflow is something like this:
- Create a temporary working directory somewhere
- Clone the site off of GitHub into that directory
- Add, delete, or make changes to files in the project
- Note changes to those files through commit messages
- Upload the finished version back to GitHub
Repeat as necessary.
Things to resolve before announcing this project.