Add site builder service to Docker Compose and remove obsolete scripts

- Introduced a new service `igny8_site_builder` in `docker-compose.app.yml` for site building functionality, including environment variables and volume mappings.
- Deleted several outdated scripts: `create_test_users.py`, `test_image_write_access.py`, `update_free_plan.py`, and the database file `db.sqlite3` to clean up the backend.
- Updated Django settings and URL configurations to integrate the new site builder module.

docker-compose.app.yml

@@ -100,6 +100,25 @@ services:
       - "com.docker.compose.project=igny8-app"
       - "com.docker.compose.service=igny8_marketing_dev"
 
+  igny8_site_builder:
+    image: igny8-site-builder-dev:latest
+    container_name: igny8_site_builder
+    restart: always
+    ports:
+      - "0.0.0.0:8025:5175"
+    environment:
+      VITE_API_URL: "https://api.igny8.com/api"
+    volumes:
+      - /data/app/igny8/site-builder:/app:rw
+      - /data/app/igny8/frontend:/frontend:ro
+    depends_on:
+      igny8_backend:
+        condition: service_healthy
+    networks: [igny8_net]
+    labels:
+      - "com.docker.compose.project=igny8-app"
+      - "com.docker.compose.service=igny8_site_builder"
+
   igny8_celery_worker:
     image: igny8-backend:latest
     container_name: igny8_celery_worker