Behaviour depending on environments should be configured not hardcoded

In several places, the code behaviour rely on which `env` it is running on

Places should be listed down here :
- `apps/captain_fact/lib/captain_fact/accounts/accounts.ex` #fetch_picture (now line 182)

The right solution is to implement test purpose module and to configure it. An example for such thing is the Arc storage : S3 in production, local in dev and test