docs: migrate.md adjust volume mount path (#2337)

The rest of the examples use `/var/www/app`, so the volume mount should
match.

---------

Signed-off-by: Francis Lavoie <lavofr@gmail.com>
Co-authored-by: henderkes <m@pyc.ac>
Co-authored-by: Alexandre Daubois <2144837+alexandre-daubois@users.noreply.github.com>

Author: 3 people

docs/migrate.md

@@ -103,10 +103,12 @@ services:
   nginx:
     image: nginx:1
     volumes:
-      - ./nginx.conf:/etc/nginx/conf.d/default.conf
+      # mount Nginx config into the container
+      - ./config:/etc/nginx/conf.d
       - .:/var/www/app
     ports:
       - "80:80"
+      - "443:443"
 
   php:
     image: php:8.5-fpm
@@ -121,7 +123,9 @@ services:
   php:
     image: dunglas/frankenphp:1-php8.5
     volumes:
-      - .:/app/public
+      - .:/var/www/app
+      # mount the Caddyfile into the container
+      - ./config:/etc/frankenphp
       - caddy_data:/data
       - caddy_config:/config
     ports: