fix(sidebar): revert dev qa content

docs/.vitepress/config/en.ts

@@ -60,32 +60,14 @@ function sidebarGuide(): DefaultTheme.SidebarItem[] {
   return [
     {
       text: 'Introduction',
-      collapsed: true,
-      items: [
-        {
-          text: 'Group heading linked to "What is VitePress?"',
-          link: 'what-is-vitepress',
-          collapsed: true,
-          items: [
-            {
-              text: 'Another group heading linked to "What is VitePress?"',
-              link: 'what-is-vitepress',
-              collapsed: true,
+      collapsed: false,
       items: [
-                {
-                  text: 'What is VitePress?',
-                  link: 'what-is-vitepress'
-                }
-              ]
-            }
-          ]
-        },
+        { text: 'What is VitePress?', link: 'what-is-vitepress' },
         { text: 'Getting Started', link: 'getting-started' },
         { text: 'Routing', link: 'routing' },
         { text: 'Deploy', link: 'deploy' }
       ]
     },
-    { text: 'What is VitePress?', link: 'what-is-vitepress' },
     {
       text: 'Writing',
       collapsed: false,