feat(vue): make vue plugin as default export

Author: Sukaato

packages/vue/readme.md

@@ -20,15 +20,15 @@ npm install @poppy-ui/vue
 The configuration is minimal and easy
 ```ts
 // main.ts
-import { PoppyVue } from '@poppy-ui/vue';
+import poppyVue from '@poppy-ui/vue';
 import { createApp } from 'vue';
 import App from './App.vue';
 
 import '@poppy-ui/vue/css/core.css';
 import '@poppy-ui/vue/css/themes/light.always.css';
 
 createApp(App)
-  .use(PoppyVue)
+  .use(poppyVue)
   .mount('#app');
 ```
 

packages/vue/src/index.ts

@@ -1,5 +1,7 @@
+import { PoppyVue } from './plugin';
+export default PoppyVue;
+
 export * from './generated/components';
-export * from './plugin';
 
 export {
   AccordionGroupCustomEvent,