Draft of a description for landing page

Author: Soreine

README.md

@@ -2,7 +2,9 @@
 search: false
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-# help.gitbook.com
+Welcome to the help center for the [GitBook.com](https://www.gitbook.com) platform and services. This knowledge base will help you use our services and manage your account, books, collaborators.
 
-This document contains the entire knowledge base related to [GitBook.com](https://www.gitbook.com).
+You can learn using the [GitBook format and toolchain here](http://toolchain.gitbook.com/).
+
+Wondering what GitBook is? [Read this](basics/what-is-gitbook.md).