[General] Environment specific configuration should be removed from source code!

Source code should not include information related to a specific deployment environment. For instance, we should provide the template of a config file instead of this one: https://forge.grandlyon.com/web-et-numerique/web-et-numerique-internet/data.grandlyon.com/web-portal/components/custom-apps/web-app/blob/development/src/assets/config/config.json.