Remove WP8 getting started

Author: objorke

getting-started/hello-windows-phone.rst

@@ -20,7 +20,6 @@ The following sections contain platform specific descriptions about how to get s
     hello-wpf-vb.rst
     hello-windows-forms.rst
     hello-silverlight.rst
-    hello-windows-phone.rst
     hello-xamarin-ios.rst
     hello-xamarin-android.rst
     hello-xamarin-forms.rst