chore: sync marketing site and workflows with local reading demo

marketing-site/next.config.mjs

@@ -1,9 +1,6 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: true,
-  // Deploy layer (deploy/docker/Dockerfile) builds the standalone
-  // output. No runtime behavior change for preview/dev.
-  output: 'standalone',
   // A stray package-lock.json sits at the repo root; pin the workspace root here
   // so Turbopack doesn't infer the wrong one.
   turbopack: {