Link macos.md to main deploying documentation (#49496)

* Initial plan

* Add link to macos.md in deploying index

Co-authored-by: agocke <515774+agocke@users.noreply.github.com>

* Update link text to 'Publishing for macOS'

Co-authored-by: agocke <515774+agocke@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: agocke <515774+agocke@users.noreply.github.com>

Author: Copilot

docs/core/deploying/index.md

@@ -535,3 +535,4 @@ For more information about container deployment, see [.NET SDK container creatio
 
 - [.NET Runtime Identifier (RID) catalog](../rid-catalog.md)
 - [Select the .NET version to use](../versions/selection.md)
+- [Publishing for macOS](macos.md)