Remove reference to markdown files

It doesn't make sense in printed versions

Author: jsmanrique

README.md

@@ -1,11 +1,8 @@
 # Managing Inner Source Projects book
 
-This repository contains the Markdown files needed to build the whole Managing
-Inner Source Projects book.
-This is intended to bring from a managerial perspective the several aspects needed
+This book is intended to bring, from a managerial perspective, the several aspects needed
 when introducing inner source methodologies into enterprises.
 
-
 This book is a work in progress process where anyone is more than welcome to contribute
 in any possible way. Ideas, comments, typos, full paragraphs or sections would be
 great. This repository aims at bringing specialized knowledge from the industry