(docs) prepare for v3.0.0

Author: MatthijsBurgh

docs/.vuepress/config.js

@@ -31,6 +31,11 @@ module.exports = {
         link:
           'https://github.com/MatthijsBurgh/vue-cli-plugin-electron-builder/tree/v1'
       },
+      {
+        text: 'v2.x',
+        link:
+          'https://github.com/MatthijsBurgh/vue-cli-plugin-electron-builder/tree/v2'
+      },
       {
         text: 'Changelog',
         link:

docs/guide/README.md

@@ -4,7 +4,7 @@ sidebarDepth: 2
 ---
 
 :::warning
-These are the docs for the v2.x.x release line, which is recommended over the v1.x version. The old docs are available [here](https://github.com/MatthijsBurgh/vue-cli-plugin-electron-builder/tree/v1/docs). To upgrade, see the [release announcement](https://github.com/nklayman/vue-cli-plugin-electron-builder/releases/tag/v2.0.0).
+These are the docs for the v3.x.x release line, which is recommended over the v2.x version. The old docs are available [here](https://github.com/MatthijsBurgh/vue-cli-plugin-electron-builder/tree/v2/docs). To upgrade, see the [release announcement](https://github.com/nklayman/vue-cli-plugin-electron-builder/releases/tag/v3.0.0).
 :::
 
 # Quick Start