Update learn to C# cert link (#8248)

* Update learn to C# cert link and update windows install instructions

* remove winget

* Update docs/csharp/get-started.md

Co-authored-by: Nick Trogh <[email protected]>

---------

Co-authored-by: Nick Trogh <[email protected]>

Author: claudiaregio

docs/csharp/get-started.md

@@ -16,9 +16,9 @@ This getting started guide introduces you to C# and .NET for Visual Studio Code
 1. Writing and running a simple "Hello World" application using C#.
 1. Introduce you to other learning resources for C# in VS Code.
 
-Keep in mind, that this guide won't teach you C#. Instead, it teaches you how to get set up for C# development in VS Code. If you're looking for resources to learn C#, check out our C# curriculum.
+Keep in mind, that this guide won't teach you C#. Instead, it teaches you how to get set up for C# development in VS Code. If you're looking for resources to learn C#, check out the free C# Certificate from freeCodeCamp.
 
-<a class="install-extension-btn" href="https://aka.ms/selfguidedcsharp">Learn C# Curriculum</a>
+<a class="install-extension-btn" href="https://aka.ms/csharp-certification">Earn C# Certification</a>
 
 ## Necessary tools