从cocos文档中拷贝出的一个版本，比较好的折叠侧

Tiny change to the expandable-chapters plugin from https://github.com/DomainDrivenArchitecture/ to use smaller arrows.

Add it to your book.json configuration:

{ plugins: ["expandable-chapters-small"] }

Install your plugins using:

$ gitbook install Configuration

There is no configuration needed at the moment, can be left empty.

{ "pluginsConfig": { "expandable-chapters-small":{} } }