docs: dropdown version

Author: posva

packages/docs/.vitepress/config/en.ts

@@ -47,6 +47,10 @@ export const enConfig: LocaleSpecificConfig<DefaultTheme.Config> = {
             text: 'Vue.js Certification',
             link: 'https://certificates.dev/vuejs/?friend=VUEROUTER&utm_source=pinia_vuejs&utm_medium=link&utm_campaign=pinia_vuejs_links&utm_content=navbar',
           },
+          {
+            text: 'v3.x',
+            items: [{ text: 'v2.x', link: 'https://v2.pinia.vuejs.org' }],
+          },
         ],
       },
     ],

packages/docs/.vitepress/config/zh.ts

@@ -58,6 +58,10 @@ export const zhConfig: LocaleSpecificConfig<DefaultTheme.Config> = {
           },
         ],
       },
+      {
+        text: 'v3.x',
+        items: [{ text: 'v2.x', link: 'https://v2.pinia.vuejs.org' }],
+      },
     ],
     sidebar: {
       '/zh/api/': [