使用gitbook plugin

使用gitbook plugin.

{
    "title": "xx doc",
    "author": "morya",
    "description": "xxx",
    "plugins": [
        "anchor-navigation-ex",
        "new-flowchart",
        "sequence"
    ],
    "pluginsConfig": {
        "anchor-navigation-ex": {
            "isRewritePageTitle": true
        }
    },
    "links": {
        "sidebar": {}
    }
}