Rename index.md to index.rst

Thanks for @luotao's comments.
purplegourd · Nov 22, 2016 · 0de93a4 · 0de93a4
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commit 0de93a4
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diff --git a/doc_cn/introduction/index.md → doc_cn/introduction/index.rst b/doc_cn/introduction/index.md → doc_cn/introduction/index.rst