removing extra NuGet command from instructions

Author: ChrisHowd

Instructions/Labs/LAB_AK_04_develop_unit_tests_xunit.md

@@ -56,12 +56,6 @@ You need to download the existing application, extract the code files, and then
 
 Use the following steps to set up the library application:
 
-1. Open a command terminal and then run the following command:
-
-    ```bash
-    dotnet nuget add source https://api.nuget.org/v3/index.json -n nuget.org
-    ```
-
 1. Open a browser window in your lab environment.
 
 1. To download a zip file containing the library application, paste the following URL into your browser's address bar: [GitHub Copilot lab - develop unit tests](https://github.com/MicrosoftLearning/mslearn-github-copilot-dev/raw/refs/heads/main/DownloadableCodeProjects/Downloads/AZ2007LabAppM4.zip)

Instructions/Labs/LAB_AK_05_refactor_improve_existing_code.md

@@ -66,12 +66,6 @@ You need to download the existing application, extract the code files, and then
 
 Use the following steps to set up the library application:
 
-1. Open a command terminal and then run the following command:
-
-    ```bash
-    dotnet nuget add source https://api.nuget.org/v3/index.json -n nuget.org
-    ```
-
 1. Open a browser window in your lab environment.
 
 1. To download a zip file containing the library application, paste the following URL into your browser's address bar: [GitHub Copilot lab - refactor existing code](https://github.com/MicrosoftLearning/mslearn-github-copilot-dev/raw/refs/heads/main/DownloadableCodeProjects/Downloads/AZ2007LabAppM5.zip)