feat: add vite-plugin-vue-component-preview plugin (#386)

src/main.ts

@@ -1,5 +1,6 @@
 import { ViteSSG } from 'vite-ssg'
 import { setupLayouts } from 'virtual:generated-layouts'
+import Previewer from 'virtual:vue-component-preview'
 import App from './App.vue'
 import type { UserModule } from './types'
 import generatedRoutes from '~pages'
@@ -18,5 +19,6 @@ export const createApp = ViteSSG(
     // install all modules under `modules/`
     Object.values(import.meta.glob<{ install: UserModule }>('./modules/*.ts', { eager: true }))
       .forEach(i => i.install?.(ctx))
+    ctx.app.use(Previewer)
   },
 )