In keeping with the open process, this project’s GitHub issue tracker is the primary communication medium for enhancing content.
The full websource is available on GitHub. Best practise would be to fork the project on GitHub, test your changes with Sphinx, and then create a pull request. Although this requires knowing/learning a little about git, python and reStructuredText, it is well worth getting familiar with these tools.
The easiest way to contribute would be sending files containing your instructional material (.odt, .doc) containing images (.png), and associated journals (.jzp, .jnl). In keeping with the open nature of this project, raise a new issue on GitHub, otherwise send an e-mail to omsai@member.fsf.org
As above, raise a new issue on GitHub, otherwise send an e-mail to omsai@member.fsf.org