BookWyrm + Caddy: Static Files Fix

Caddy is proxying directly to Gunicorn, which doesn't serve static files. It returns HTML for every /static/ request, and the browser blocks it due to MIME type mismatch.

The fix is to add a small nginx container between Caddy and Gunicorn. nginx serves /static/ and /images/ straight from the Docker volumes, and passes everything else to Gunicorn.

1. Add the nginx config

Create nginx-books/nginx.conf next to your docker-compose.yml: