docs(vue): add vue-router in installation sections

Related to #2764

docs/content/1.getting-started/7.i18n/2.vue.md

@@ -93,12 +93,20 @@ bun add vue-i18n@10
 
 #### Use the Vue I18n plugin in your `main.ts`
 
-```ts [main.ts]{2,6-18,22}
+```ts [main.ts]{3,14-26,29}
 import { createApp } from 'vue'
+import { createRouter, createWebHistory } from 'vue-router'
 import { createI18n } from 'vue-i18n'
 import ui from '@nuxt/ui/vue-plugin'
 import App from './App.vue'
 
+const app = createApp(App)
+
+const router = createRouter({
+  routes: [],
+  history: createWebHistory()
+})
+
 const i18n = createI18n({
   legacy: false,
   locale: 'en',
@@ -113,8 +121,7 @@ const i18n = createI18n({
   }
 })
 
-const app = createApp(App)
-
+app.use(router)
 app.use(i18n)
 app.use(ui)