message: docs: update site version link
diff: @@ -14,7 +14,7 @@ module.exports = {
  defaultLang: 'en-US',
  versions: [
  { label: '1.x', link: '/vant/1.x/' },
  - { label: '3.x', link: '/vant/next/' },
  + { label: '2.x', link: '/vant/' },
  ],
  baiduAnalytics: {
  seed: 'ad6b5732c36321f2dafed737ac2da92f',
  