Gitbook on Github
Gitbook documentation
Gitbook default theme

npm install -g gitbook-cli

gitbook init  // initialize project in the current folder
gitbook instal l // install and prepare all plugins
gitbook serve  // preview book

gitbook build  // build static pages

You can serve the Gitbook by opening the index.html file manually or with

firefox index.html 
// or
php -S localhost:8000