Vue3 Migration Guide

https://v3-migration.vuejs.org/migration-build.html#upgrade-workflow

• Named Slot 교체
  • https://v2.vuejs.org/v2/guide/components-slots.html#Deprecated-Syntax
• Setting Vue3 Migration build
  • https://www.npmjs.com/package/@vue/compat
• Compat Config 수정
• Vue2 Syntax error 수정
  • Compat Config 옵션 수정하면서 생기는 Error들을 하나씩 수정
• Upgrade Vuex, vue-router
  • Compat Config 수정
• Compat 제거 후 정상적으로 동작하는지 확인