docs(upgrading): remove old upgrade guide

Author: nklayman

docs/.vuepress/config.js

@@ -36,8 +36,7 @@ module.exports = {
         'configuration',
         'recipes',
         'testingAndDebugging',
-        'commonIssues',
-        'upgrading'
+        'commonIssues'
       ]
     },
     repo: 'nklayman/vue-cli-plugin-electron-builder',

docs/guide/README.md

@@ -9,10 +9,6 @@ sidebarDepth: 2
 Your app must be created with Vue-CLI 3 (vue create my-app), will not work with Vue-CLI 2 (vue init webpack my-app)!
 :::
 
-::: tip Upgrade Notice
-These docs are for the v1.0.0 release of VCP Electron Builder. If you were previously using an older version of vue-cli-plugin-electron-builder (<1.0.0), please see the [upgrade guide](./upgrading.md) or [view the old docs](https://github.com/nklayman/vue-cli-plugin-electron-builder/tree/legacy).
-:::
-
 ## Installation
 
 Open a terminal in the directory of your app created with Vue-CLI 3.