Merge pull request github#5160 from github/King-of-Spades-patch-1

[Contributing guide] Replace broken image link

CONTRIBUTING.md

@@ -9,7 +9,7 @@ Before you begin:
 
 ### Use the 'make a contribution' button
 
-![](./assets/images/make-contribution.gif)
+<img src="./assets/images/contribution_cta.png" width="400">
 
 Navigating a new codebase can be challenging, so we're making that a little easier. As you're using docs.github.com, you may come across an article that you want to make an update to. You can click on the **make a contribution** button right on that article, which will take you to the file in this repo where you'll make your changes.