Simplify deployment by removing the reverse proxy configuration

Removes Nginx configuration, updates Docker Compose, README, and .env.example to streamline deployment and access the application directly on port 5000.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/6e755801-08e8-4492-805e-ac3610de5a2a.jpg

docker-compose.yml

@@ -50,20 +50,7 @@ services:
       retries: 3
       start_period: 60s
 
-  # Nginx reverse proxy (optionnel)
-  nginx:
-    image: nginx:alpine
-    container_name: regisflow-nginx
-    depends_on:
-      - regisflow
-    volumes:
-      - ./nginx.conf:/etc/nginx/nginx.conf:ro
-    ports:
-      - "80:80"
-      - "443:443"
-    networks:
-      - regisflow-network
-    restart: unless-stopped
+
 
 volumes:
   postgres_data: