fix: Support relative image paths in ContributorHeader component

[wo-o29]

📝 Key Changes

This PR fixes an issue where the ContributorHeader component couldn't render avatar images when using relative paths (ex: ../../images/contribute/suspense-error/hyungkyu.png).

Problem

• VitePress processes markdown images (![](...)) differently from Vue component props
• Markdown images are automatically bundled and hashed during build, but component prop strings are not statically analyzed
• This caused avatar images to return 404 errors when using relative paths

Solution

• Added dynamic image using import.meta.glob to bundle all contributor images at build time
• Implemented fallback logic to support both absolute paths (/images/...) and relative paths

Impact

This change enables contributors to use the component as documented in the contribution template without encountering image rendering issues:

<ContributorHeader name="이름" avatar="../../images/contribute/profile-default.png" />

🖼️ Before and After Comparison

Before	After

[vercel]

@wo-o29 is attempting to deploy a commit to the Toss Team on Vercel.

A member of the Team first needs to authorize it.

[milooy]

👍 You are the best!

[milooy]

그 와중에 헤더에 변경사항이 들어가있어서 컨플릭이 났네요.
괜찮으실 때 컨플릭 해결 부탁드립니다! 🙏

[wo-o29]

@milooy 수정해서 개발 / 빌드 결과물 환경에서 잘 나오는 것으로 확인했습니다!

개발 환경	빌드 결과물 환경

이전에 레거시 문서 삭제하는 작업도 진행하였는데, 괜찮으시다면 이것도 같이 검토 해주실 수 있으실까요?🙏🏻