detail see https://panjiachen.github.io/vue-element-admin-site/#/zh-cn/lazy-loading?id=%E8%B7%AF%E7%94%B1%E6%87%92%E5%8A%A0%E8%BD%BD
* bump deps: update vue-splitpane version * refactor[chore]: use webpack-dev-serve build * perf:settings * doc: uodate readme
