direct to mainpage links (#7)

Author: mesmith027

README.md

@@ -6,9 +6,9 @@ This is the companion repo to: [Complete Docker Course - From BEGINNER to PRO! (
 
 ## Sponsor
 
-[![](./readme-assets/shipyard-logo.png)](https://shipyard.social/mainpage)
+[![](./readme-assets/shipyard-logo.png)](https://shipyard.build/)
 
-Thank you to [Shipyard](https://shipyard.social/mainpage) for sponsoring this course! It is because of their support that I am able to provide it to the community free of charge!
+Thank you to [Shipyard](https://shipyard.build/) for sponsoring this course! It is because of their support that I am able to provide it to the community free of charge!
 
 Shipyard is the easiest way to generate on demand ephemeral environments (aka a new environment for every pull request). Sign up today at https://shipyard.social/DevOpsDirectivePromo! The first 300 people to use the promo code "DEVOPSDIRECTIVE" will receive an additional 30 days free on either their startup or business tier plans!