Prettier 적용하기

https://velog.io/@j1min/Vscode-Prettier-%EC%A0%81%EC%9A%A9-%EC%95%88%EB%90%A8-%EA%B3%A0%EC%B9%98%EB%8A%94%EB%B2%95

https://yjg-lab.tistory.com/91