refactor(popup): index 파일 추출

Author: drakang4

packages/popup/src/index.ts

@@ -0,0 +1,2 @@
+export * from './popup'
+export { default } from './popup'

packages/popup/src/popup.stories.tsx

@@ -1,7 +1,7 @@
 import { ComponentMeta, ComponentStoryObj } from '@storybook/react'
 import styled from 'styled-components'
 
-import Popup from '.'
+import Popup from './popup'
 
 export default {
   title: 'popup / Popup',