feat(post): add new post "Jekyll Theme Compatibility"

_app/_posts/news/2016-11-07-jekyll-theme-compatibility.md

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+---
+layout: post
+title: Jekyll Theme Compatibility
+category: news
+---
+
+With recent release of Jekyll, it gets the built-in ability to support [themes](https://jekyllrb.com/docs/themes/), since we've already added theme support in 2015, the original config variables `theme` would be conflicted with the built-in one.
+
+To solve this issue, I've rename our `theme` option to `amsf_theme`. So now you can simply rename your original `theme` option in `_amsf.yml` to `amsf_theme` after processing the update.