🗑️(backend) remove useless cold storage config

No S3 bucket or cold storage are required yet in the project.
As the charts related to these pieces were removed, clean
Dajngo configuration.

src/helm/env.d/dev/values.meet.yaml.gotmpl

@@ -38,10 +38,6 @@ backend:
     POSTGRES_USER: dinum
     POSTGRES_PASSWORD: pass
     REDIS_URL: redis://default:pass@redis-master:6379/1
-    AWS_S3_ENDPOINT_URL: http://minio.meet.svc.cluster.local:9000
-    AWS_S3_ACCESS_KEY_ID: meet
-    AWS_S3_SECRET_ACCESS_KEY: password
-    AWS_STORAGE_BUCKET_NAME: meet-media-storage
     STORAGES_STATICFILES_BACKEND: django.contrib.staticfiles.storage.StaticFilesStorage
     {{- with .Values.livekit.keys }}
     {{- range $key, $value := . }}