Create a documentation section and update the documentation

This is a good idea. Also, depending on how much Zen code we reuse, it would be nice to add documentation for each tpl file and it's variables, like Zen does (http://drupal.org/node/1728090). Then add the add the link to the documentation at the top of each tpl, respectively.

Created child book page: http://drupal.org/node/1976938

Updated issue summary.

Converted the markdown readme of the "sub-theme how to" at: http://drupal.org/node/1978010. We should probably make a beta4 release so these pages and project page can be updated accordingly.

Actually I'm thinking we should just include the link to the root documentation page and the "Creating a Bootstrap sub-theme" page inside the project's README and take the documentation out of the project. It will help reduce duplication and inconsistency errors.

Done. I removed the documentation from the repo and provided the above links instead. I also updated the project page. This allows the updating documentation much easier since it's separate from the repo.