consider support vue data through config globally

maybe we can change this line of code:
https://github.com/docsifyjs/docsify/blob/1a945d445a636d778b242f9d74af4f72c7d89e16/src/core/render/index.js#L60
to include data from config file, code may like this:
```js
      window.__EXECUTE_RESULT__ = new window.Vue({ data: this.config.vueData }).$mount('#main')
```