docs: Fix cache step of React and Next example

README.md

@@ -495,10 +495,10 @@ jobs:
     - name: Cache dependencies
       uses: actions/cache@v1
       with:
-        path: ~/.npm
-        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+        path: ~/.cache/yarn
+        key: ${{ runner.os }}-yarn-${{ hashFiles(format('{0}{1}', github.workspace, '/yarn.lock')) }}
         restore-keys: |
-          ${{ runner.os }}-node-
+          ${{ runner.os }}-yarn-
 
     - name: install
       run: yarn install