On the Developer Drive site today there's a quick post introducing you to Couscous, a PHP-based documentation generation tool. Couscous translates your Markdown files into HTML output that's professional and clean looking.
If there’s one thing I hate more than tracking down bugs, it’s documenting code. It takes forever, it’s almost a project in itself, and I never seem to factor it into my project lifecycle. Setting out to solve that problem for me, and anyone else whose life is too short, is Couscous. Couscous takes markdown files and converts them into professional standard HTML docs that colleagues, or fellow developers, can easily follow. You can preview the resulting site on your local machine, correct any issues, and then deploy straight to GitHub where it will be hosted for you.
They walk you through the (brief) process of getting the tool installed via Composer and using it to show you a preview of your documentation. The "deploy" command then allows you to easily deploy the results out to a GitHub Pages location on the gh-pages branch. You can find out more about Couscous on the project website.