Update README.md

Author: lorensr

README.md

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 If you'd like to read the GraphQL Guide, and if you can afford to purchase it or if your company reimburses you for educational materials (most do 👍), we would value your support: [https://graphql.guide](https://graphql.guide).
 
-## graphql.guide
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-Branch `master` is deployed to [https://graphql.guide](https://graphql.guide), and in addition to the app created in the book, has the landing page. To see the book app, visit [graphql.guide/Preface](https://graphql.guide/Preface) (at the moment lorem ipsum).
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 ## Chapter 6
 
 Numbered branches (`0` and up) have the most up-to-date code (often newer than the most recent published revision of the book). When code has changed between book revisions, a new code version is created, and each branch is tagged, with the naming format `[step]_[version]`. For instance, r1 of the book was published with version `0.1.0` of this repo, so the tag for step 5 was [`5_0.1.0`](https://github.com/GraphQLGuide/guide/releases/tag/5_0.1.0).
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 ![Github PR creation](https://res.cloudinary.com/graphql/pr-base.png)
 
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 *Setting the base branch to step `3`*
 
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