it is difficult for us to put a button it is also hard for a new user to manually chase the various Github repositories

Not sure I follow—all the notebooks on the website include (or should include) links to their source location in GitHub. For example, the GitHub button in this Addons tutorial 1 points you to the correct repo location.

ghbuttons1000×375 84.8 KB

But we can’t use a specific link in the footer since the footer is site-wide.