Add more flexibility with config datas

Problem

For example, each component should be able to define a database configuration of its own.

Solution

Migrate config datas from ini to yaml.

Example

default:
  …
  database:
  ┊ provider: postgresql
  ┊ type: socle
  ┊ admindatabase: postgres
  ┊ adminpassword: changeme
  ┊ adminuser: postgres
…
keycloak:
  …
  database:
  ┊ name: keycloak
  ┊ password: keycloak
  ┊ user: keycloak