[Docs] Add C# Markup examples for all XAML usage examples

[kazo0]

Find all usage examples that are specific to XAML, including the Get Started pages on bootstrapping Toolkit and create a tabbed layout similar to the Uno Getting Started

[dansiegel]

Let's also be sure to update the docs as it makes sense so that we are clear that if you are using C# Markup you will want to install the Markup version of the package... We could also clarify that if you are using XAML install Uno.Toolkit.WinUI but if you are using C# Markup then install Uno.Toolkit.WinUI.Markup

[eriklimakc]

Let's also be sure to update the docs as it makes sense so that we are clear that if you are using C# Markup you will want to install the Markup version of the package... We could also clarify that if you are using XAML install Uno.Toolkit.WinUI but if you are using C# Markup then install Uno.Toolkit.WinUI.Markup

Good one! I will make sure to add this info, thanks!