fix: 🐛 Remove deprecated npx export in deploy receipe

Author: JingWangTW

.github/workflows/nextjs.yml

@@ -75,8 +75,6 @@ jobs:
         run: ${{ steps.detect-package-manager.outputs.manager }} ${{ steps.detect-package-manager.outputs.command }}
       - name: Build with Next.js
         run: ${{ steps.detect-package-manager.outputs.runner }} next build
-      - name: Static HTML export with Next.js
-        run: ${{ steps.detect-package-manager.outputs.runner }} next export
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v2
         with: