docs(README.md, README-en_us.md): 리드미 내의 링크 수정

[ho991217]

Overview

리드미 문서 내 URL의 상대경로를 절대 경로로 수정하여
외부 경로(es-hangul npm 등)에서 CONTRIBUTING.md, README.md, README-en_us.md등의 파일에 접근가능하도록 수정하였습니다.

PR Checklist

• I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5904e72

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[vercel]

@ho991217 is attempting to deploy a commit to the Toss Team on Vercel.

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[okinawaa]

감사합니다!