chore: remove plugin notification (vuejs#1394)

Author: shigma

packages/@vuepress/plugin-notification/.npmignore

@@ -70,7 +70,6 @@ module.exports = ctx => ({
       updatePopup: true
     }],
     ['@vuepress/medium-zoom', true],
-    ['@vuepress/notification', true],
     ['@vuepress/google-analytics', {
       ga: 'UA-128189152-1'
     }],

packages/@vuepress/plugin-notification/README.md

@@ -1,8 +1,7 @@
-export default ({
-  Vue, // the version of Vue being used in the VuePress app
-  options, // the options for the root Vue instance
-  router, // the router instance for the app
-  siteData // site metadata
-}) => {
-  // ...apply enhancements to the app
+export default ({ Vue, isServer }) => {
+  if (!isServer) {
+    import('vue-toasted' /* webpackChunkName: "notification" */).then((module) => {
+      Vue.use(module.default)
+    })
+  }
 }

packages/@vuepress/plugin-notification/enhanceAppFile.js

@@ -28,10 +28,10 @@
     "@vuepress/plugin-google-analytics": "^1.0.0-alpha.42",
     "@vuepress/plugin-i18n-ui": "^1.0.0-alpha.42",
     "@vuepress/plugin-medium-zoom": "^1.0.0-alpha.42",
-    "@vuepress/plugin-notification": "^1.0.0-alpha.42",
     "@vuepress/plugin-pwa": "^1.0.0-alpha.42",
     "@vuepress/theme-vue": "^1.0.0-alpha.42",
     "vuepress": "^1.0.0-alpha.42",
-    "vuepress-plugin-flowchart": "^1.4.2"
+    "vuepress-plugin-flowchart": "^1.4.2",
+    "vue-toasted": "^1.1.25"
   }
 }