Update with all changes from skills-dev fork (#310)

Author: FidelusAleksander

.github/steps/x-review.md

@@ -14,7 +14,7 @@ Here's a recap of the tasks you've accomplished in this exercise:
 
 ### What's next?
 
-- Take another [GitHub Skills exercise](https://github.com/skills).
+- Take another [GitHub Skills exercise](https://learn.github.com/skills).
   - Continue with the [GitHub Pages](https://github.com/skills/github-pages) exercise to share your blog posts as an actual webpage.
 - Learn more about [Markdown](https://docs.github.com/github/writing-on-github).
 - Read the GitHub [Getting Started docs](https://docs.github.com/get-started).