Remove license notice to allow Kindle publishing

Technically we'll need to set a price, since that's how Amazon works.
But we won't make a profit, so we're still not breaking our own license.

chapters/01-introduction-ebook.md

@@ -2,11 +2,6 @@
 
 © 2020 Rendered Text. All rights reserved.
 
-This work is licensed under Creative Commmons
-Attribution-NonCommercial-NoDerivatives 4.0 International.
-To view a copy of this license, visit
-<https://creativecommons.org/licenses/by-nc-nd/4.0>
-
 This book is open source:
 <https://github.com/semaphoreci/book-cicd-docker-kubernetes>