chore: 메인 페이지와 상세 페이지 query 공유하게 만들기

[wherehows]

참고

• https://www.gatsbyjs.com/docs/reference/graphql-data-layer/using-graphql-fragments/
• https://www.codeconcisely.com/posts/how-to-write-reusable-queries-in-gatsby/