Fixing default behavior of example code to prevent wrongful git clone

[bdoolittle]

Hello,

I'm proposing a small change to the sphinx-action README.

Problem: The deploy docs example in the README is a valid action that will run successfully without modification. This action will clone code from https://github.com/ammaraskar/sphinx-action-test.git by default. This behavior is problematic because it allows users to copy-paste the action and successfully run it without the necessary modifications. If no changes are made the action clones @ammaraskar 's sphinx-action-test github repository in to the gh-pages branch of the local repository trying to use the action leading to an unfortunate side-effect.

• User ammaraskar is added as a contributor to the project. This action cannot be undone.

It is not in users' interest to accidentally add a contributor to the project who does not belong on the project. It is not in ammaraskar's interest to be added to projects that they did not willingly contribute to.

Solution: Don't let users shoot themselves in the foot. Replace the git clone URL with a fake repository. If run without proper modification, the action will simply fail. This approach is safer and more desirable than erroneously adding a contributor who does not belong on the project

[ammaraskar]

Thanks, this makes sense to me.