Building the documentation is easy using the bundled Grunt tasks.
From the theme root you can use the following command to generate the documentation.
$ grunt docs
The dependencies will be installed and the documentation will be built and compiled into the
/documentation/build/html/ directory. Feel free to preview the documentation before pushing changes live to the site.
When you are happy with the changes, the documentation can be deployed using:
$ grunt deploy-docs
Once completed your changes should immediately be visible at https://godaddy.github.io/wp-primer-theme/index.html