chore: Node.js 캐시를 npm에서 yarn으로 변경하고 의존성 설치 방법 수정

Author: toothlessdev

.github/workflows/deploy.yml

@@ -26,12 +26,12 @@ jobs:
               uses: actions/setup-node@v4
               with:
                   node-version: 22
-                  cache: npm
+                  cache: yarn
             - name: Setup Pages
               uses: actions/configure-pages@v4
 
             - name: Install dependencies
-              run: npm ci
+              run: yarn install --frozen-lockfile
 
             - name: Build with VitePress
               run: npm run docs:build