feat(vue-playground): dark mode supports

Author: 2214962083

packages/doc-site/.vuepress/plugins/index.ts

@@ -5,7 +5,6 @@ import {ShikiPluginOptions} from '@vuepress/plugin-shiki'
 import {path} from '@vuepress/utils'
 import {PluginConfig} from 'vuepress'
 import {isProd} from '../utils/common'
-// import {demoPlugin} from './vuepress-plugin-demo'
 
 const pathResolve = (..._path: string[]) => path.resolve(__dirname, ..._path)
 
@@ -81,7 +80,6 @@ const vuepressPlugins: PluginConfig[] = [
       componentsDir: pathResolve('../components')
     }
   ],
-  // demoPlugin()
   ['vuepress-plugin-sandbox', {}]
 ]