update node version

.github/workflows/documentation.yml

@@ -20,7 +20,8 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
+          node-version: 14.x
+          cache: yarn
       - name: Test Build
         run: |
           cd website
@@ -41,13 +42,19 @@ jobs:
 
       - uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
-
+          node-version: 14.x
+          cache: yarn
       - name: 🔨 Build
         run: |
           cd website
+          if [ -e yarn.lock ]; then
           yarn install --frozen-lockfile
-          yarn build
+          elif [ -e package-lock.json ]; then
+          npm ci
+          else
+          npm i
+          fi
+          npm run build
 
       - name: 📂 Sync files
         uses: SamKirkland/FTP-Deploy-Action@4.0.0