Update contribution tut link desc (#4382)

* Updated Contribution tutorial link and description.

* Updated Contribution tutorial link and description.

* Updated Contribution tutorial link and description.

Co-authored-by: Lukas Taegert-Atkinson <lukastaegert@users.noreply.github.com>

CONTRIBUTING.md

@@ -14,7 +14,7 @@ We welcome any type of contribution, not only code. You can help with
 
 ## Your First Contribution
 
-Working on your first Pull Request? You can learn how from this _free_ series, [How to Contribute to an Open Source Project on GitHub](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github).
+Working on your first Pull Request? You can learn how from this _free_ course, [How to Contribute to an Open Source Project on GitHub](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github).
 
 ## Submitting code