Sync document with latest version

[xunzhang]

Starting from this commit https://github.com/douban/paracel/commit/c81b4ff94f48e4e22d0cc8ec0170cc25c8027489, the deployment section of document is a little lagged with v0.3.0. Some users complained about that! To make it work, we need to update the document. Also honor different document versions for different Paracel releases.