Remove the README warning about binaries
Remove the README warning about binaries

Now that the workflow is flutter-tool based, this is much less likely to be
something want to try to do, and it adds a lot of text to the example page
(which is meant to be simple) for that very niche case.
google/flutter-desktop-embedding,google/flutter-desktop-embedding,google/flutter-desktop-embedding,google/flutter-desktop-embedding,google/flutter-desktop-embedding