🐛(project) run production image locally with docker-compose

The local deployment of the Production image through docker-compose was
failing due to issues in the Django configurations, influenced by Joanie.

The bug stemmed from a dependency on a development-specific package
(drf-spectacular-sidecar) while attempting to run the application in
production mode.

Changes Made:
- Introduced new Django settings for local demo environments.
- Uncommented the nginx configuration to address the production image
  deployment issues.

docker-compose.yml

@@ -66,7 +66,7 @@ services:
     user: ${DOCKER_USER:-1000}
     image: people:production
     environment:
-      - DJANGO_CONFIGURATION=ContinuousIntegration
+      - DJANGO_CONFIGURATION=Demo
     env_file:
       - env.d/development/common
       - env.d/development/postgresql
@@ -81,7 +81,7 @@ services:
     image: people:production
     command: ["celery", "-A", "people.celery_app", "worker", "-l", "INFO"]
     environment:
-      - DJANGO_CONFIGURATION=ContinuousIntegration
+      - DJANGO_CONFIGURATION=Demo
     env_file:
       - env.d/development/common
       - env.d/development/postgresql