Update README to correct package management commands from npm to Yarn

Violet-Bora-Lee · Violet-Bora-Lee · commit 88910fc23049 · 2025-04-30T06:57:23.000+04:00
diff --git a/complete/javascript/README.md b/complete/javascript/README.md
@@ -14,14 +14,14 @@
 ### 설치 및 실행
 ```bash
 # 의존성 설치
-npm install
+yarn install
 
 # 개발 서버 실행
-npm dev
+yarn dev
 
 # 프로덕션 빌드
-npm build
+yarn build
 
 # 빌드 미리보기
-npm preview
+yarn preview
 ```
