Fix prerequisites link in README.md

Updated prerequisites link for Copilot exercise.

Author: WirelessLife

Integrate-MCP-with-Copilot/README.md

@@ -7,7 +7,7 @@ _Learn how to give GitHub Copilot more tools to expand the capabilities of your
 - **Who is this for**: Developers looking to enhance their AI-assisted workflows, GitHub Copilot users, and AI enthusiasts.
 - **What you'll learn**: We'll introduce MCP basics, a GitHub MCP server setup, and integration with Copilot Agent Mode.
 - **What you'll build**: A mixed development workflow that uses GitHub Copilot to manage issues while upgrading the extracurricular activities website for Mergington High School.
-- **Prerequisites**: [Getting Started with Copilot](https://github.com/skills/getting-started-with-github-copilot) Exercise
+- **Prerequisites**: [Getting Started with Copilot](https://github.com/microsoft/Mastering-GitHub-Copilot-for-Paired-Programming/tree/main/Getting-Started-with-GitHub-Copilot) Exercise
 - **How long**: This exercise takes less than one hour to complete.
 
 In this exercise, you will: