Edit github workflow

Author: Hyeokmin Kwon

.github/workflows/docs.yml

@@ -24,7 +24,6 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: "16"
-          cache: "npm"
 
       - name: Build GitBook
         run: |
@@ -51,7 +50,6 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: "16"
-          cache: "npm"
 
       - name: Build GitBook
         run: |