chore(deps-dev): bump Node from 12.x to 14.x in Docs workflow (#139)

.github/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v2
         with:
-          node-version: '12.x'
+          node-version: '14.x'
       - name: Install dependencies
         run: npm ci
       - name: Build Storybook