robust-computer/web ? reverse-engineered prompt

Build me a polished full stack marketing site for Robust Computer with a matching API.

I want the landing site to be a clean React app with a strong brand feel, responsive layout, good SEO, and pages like Home, About, and Contact. It should support English, Spanish, and French, and include reusable sections like a hero, navbar, footer, and a notes or updates area. Please make the UI feel modern and production ready, with sensible reusable components and smooth interactions.

On the backend, set up an Express API with MongoDB for contact enquiries, newsletter subscriptions, and bug reports, plus email sending for those flows. Please include local development support with separate env files for dev and prod, and make sure the app can run both together easily. If you need current docs for any libraries or deployment behavior, look them up online.

Also include the RSS and feed generation workflow, plus basic smoke checks so I can verify the site and server are working.