Update GitBook info

.gitignore

@@ -0,0 +1 @@
+_book/

.gitlab-ci.yml

@@ -21,4 +21,4 @@ pages:
     paths:
       - public
   only:
-    - pages # this job will affect only the 'pages' branch
+    - master # this job will affect only the 'master' branch

README.md

@@ -4,13 +4,6 @@
 
 Example [GitBook] website using GitLab Pages.
 
-This project uses an orphan branch (`pages`) to [host the book][], since GitBook
-[expects a README.md](http://toolchain.gitbook.com/structure.html) file present
-in the root directory, and we already use one in the `master` branch  to provide
-information about GitBook on GitLab Pages. That way, you can have your project's
-code in the `master` branch and use `pages` for accommodating only your website
-content.
-
 Learn more about GitLab Pages at https://pages.gitlab.io and the official
 documentation https://docs.gitlab.com/ce/user/project/pages/.
 
@@ -57,7 +50,7 @@ pages:
     paths:
       - public
   only:
-    - pages # this job will affect only the 'pages' branch
+    - master # this job will affect only the 'master' branch
 ```
 
 ## Building locally
@@ -65,7 +58,6 @@ pages:
 To work locally with this project, you'll have to follow the steps below:
 
 1. Fork, clone or download this project
-1. Track `pages` branch: `git checkout --track origin/pages`
 1. [Install][] GitBook `npm install gitbook-cli -g`
 1. Fetch GitBook's latest stable version `gitbook fetch latest`
 1. Preview your project: `gitbook serve`

SUMMARY.md

@@ -0,0 +1,4 @@
+# Summary
+
+* [Introduction](README.md)
+