Adding some information about not pushing to this remote.

README-jekyll.md

@@ -7,5 +7,19 @@ This repository contains the required stuff to make the NJOY website and keep it
 ## Using jekyll-website
 For all projects under the NJOY organization, this repository should be created as a git 'subtree' in the `docs` directory. This will ensure consistency across all the projects as well as make the documentation for each accessible from the website. 
 
+In order to prevent pushing to this repository one should set the push url for this remote in git like this:
+
+```bash
+git remote set-url --push <name> no_push
+```
+Here `<name>` is the name of the remote (probably `jekyll`). What this tells git is whenever you try to push to this remote, simply push to the url `no_push` which doesn't exist. 
+
+Alternatively, you can set the push url to the url of the remote of the real repository like:
+
+```bash
+git remote set-url --push jekyll [email protected]:njoy/njoy.github.io.git
+```
+as is done for the [njoy.github.io](https://github.com/njoy/njoy.github.io) repository.
+
 ## License
 This repository---and all repositories under the NJOY organization---are licensed according to the [LICENSE](LICENSE.md) file