fix: update references to use skills-dev (#1)

Author: FidelusAleksander

.github/steps/x-review.md

@@ -13,6 +13,6 @@ Here's a recap of all the tasks you've accomplished in your repository:
 
 ### What's next?
 
-- [Take another exercise](https://skills.github.com/)
+- [Take another exercise](https://learn.github.com/skills)
 - [Learn more about GitHub Actions](https://docs.github.com/actions/)
 - [Awesome Actions](https://github.com/sdras/awesome-actions)

README.md

@@ -9,7 +9,7 @@ Automation is key for repetitive tasks like testing, scanning, review, and deplo
 - **Who is this for**: Developers, DevOps engineers, Security engineers
 - **What you'll learn**: How to create GitHub Actions workflows, how to run them, and how to use them to automate tasks.
 - **What you'll build**: An Actions workflow that will comment on a pull request when it is created.
-- **Prerequisites**: [Introduction to GitHub](https://github.com/skills/introduction-to-github)
+- **Prerequisites**: [Introduction to GitHub](https://github.com/skills-dev/introduction-to-github)
 - **How long**: This exercise can be finished in less than 30min.
 
 In this exercise, you will: