refactor: 이미지 경로 변경

README.md

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 # GGF-Design-System
 
-<img src='https://sprint-fe-project.s3.ap-northeast-2.amazonaws.com/globalnomad/activity_registration_image/2-3_216_1714106828318.png' alt='image' />
+![GGF-Design-System](https://github.com/sprint-team3/GGF-Design-System/assets/43297823/8d9b448c-06f6-4990-a45c-8102074c827e)
 
 GGF UI is an open-source React component library. It is designed for easy accessibility, allowing anyone to use its components effortlessly. Comprised of components with a dark mode-friendly default configuration, it promotes user-friendly design practices.