Series 내부 PostList 의 previewImage 가 등장하도록 수정

[msung99]

작업 내용 (Work Content)

• Series 의 PostList 의 미리보기 이미지가 등장하지 않았다.
• graphql 쿼리문에 previewImage 필드를 추가하여 미리보기가 등장하도록 수정했다.

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관련 이슈 넘버 (Related Issue Number)

5

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