Attempt to address nuget.config warnings.

Author: mijpeterson

nuget.config

@@ -2,16 +2,6 @@
 <configuration>
   <packageSources>
     <clear />
-    <add value="https://office.pkgs.visualstudio.com/DefaultCollection/_packaging/Office/nuget/v3/index.json" key="Office" />
+    <add key="Office" value="https://pkgs.dev.azure.com/office/_packaging/Office/nuget/v3/index.json"/>
   </packageSources>
-  <packageSourceCredentials>
-    <Office>
-      <add key="Username" value="aad_token" />
-      <add key="ClearTextPassword" value="%ADO_TOKEN%" />
-    </Office>
-  </packageSourceCredentials>
-
-  <disabledPackageSources>
-    <clear />
-  </disabledPackageSources>
 </configuration>