Github Page for User Site 只要使用 master 分支就好，但是 for Project Site 需要 push 代码到 gh-pages 分支
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For Project pages, the gh-pages branch is used to publish your site.
用 Git GUI 比如 SourceTree, Github Desktop 来切换分支到 gh-pages，commit，push，再切换回来 master branch，操作起来太繁琐。
Git 命令行会提高很多效率
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git checkout master
git status
git commit -am "Committing changes to master"
git push origin master
git checkout gh-pages
git rebase master # or merge, whatever your preference
git push origin gh-pages
git checkout master
