Remove split code.
Squashed 'article/' content from commit 83975c6

git-subtree-dir: article
git-subtree-split: 83975c681b28c69ccf30ff24dd0e774309991b1b
Merge commit '0b8840959da0a191da87e14bea7e5af1bebbf8d8' as 'article'
update article