Delete this repro since this sample is now in Windows-classic-samples repo

[ChrisGuzak]

https://github.com/Microsoft/Windows-classic-samples/tree/master/Samples/DesktopToasts

Is the new location for this sample. This repo should be deleted.

[giuntnic]

Just an FYI, if this repo does get deleted some of the public docs hard link to the files in this repo i.e. https://docs.microsoft.com/en-us/windows/uwp/design/shell/tiles-and-notifications/send-local-toast-desktop-cpp-wrl which is how I got here