Migration Health Check

[dahlbyk]

• Ask for org/repo
• ✅ repo has gh-pages branch
• ✅ repo has master branch
• ✅ repo master tree does not have docs/

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• https://github.com/blog/2228-simpler-github-pages-publishing
• https://help.github.com/articles/configuring-a-publishing-source-for-github-pages/