Update README.md

Author: ilg-ul

README.md

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-[![Build Status](https://travis-ci.com/eclipse-embed-cdt/web-jekyll.svg?branch=master)](https://travis-ci.org/eclipse-embed-cdt/web-jekyll)
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 # The Eclipse Embedded CDT web site
 
 This is the GitHub Pages project intended to store the
 public HTML version of the **Eclipse Embedded CDT web site**.
 
 The actual content, generated by Jekyll, is in the `docs` folder.
 
+**DO NOT** send pull requests to this project, use the 
+[web-jekyll](https://github.com/eclipse-embed-cdt/web-jekyll),
+where the site source is located.
+
 The web site URL is:
 
 - https://eclipse-embed-cdt.github.io/