$ git clone git@github.com:tinymce/tinymce-docs.git
$ cd tinymce-docs
$ sudo gem install bundle
$ bundle install
$ cp _config-local.sample.yml _config-local.yml
$ echo [] > _data/nav_api.json
Edit _config-local.yml accordingly with your workflow, you may want to set shared_baseurl: "https://tinymce.com" for example in order to use the correct styles and CSS.
$ jekyll serve --config _config.yml,_config-local.yml
Navigate to http://127.0.0.1:4000/