Revert "Add i18n fallback and outdated warning (#530)"

This reverts commit 9c05e8d94e.

docs/.vuepress/config.ts

@@ -10,7 +10,6 @@ import process from 'node:process'
 // import { getDirname, path } from '@vuepress/utils'
 import { getDirname, path } from 'vuepress/utils'
 import { MermaidPlugin } from './plugins/mermaid/node/mermaid'
-import i18nPlugin from "vuepress-plugin-i18n";
 
 const __dirname = getDirname(import.meta.url)
 console.log('>>> __dirname -> ', __dirname)
@@ -26,20 +25,6 @@ console.log(
 
 export default defineUserConfig(<UserConfig>{
   plugins: [
-    i18nPlugin({
-      updatedTime: "git",
-      locales: {
-        en: {
-          lang: "en-US",
-          untranslated: {
-            title: "Untranslated"
-          },
-          outdated: {
-            title: "Outdated"
-          }
-        }
-      }
-    }),
     searchPlugin({
       locales: {
         "/": {