Replace invalid session/end endpoint with correct logout endpoint in Keycloak
configuration. Fixes broken logout functionality that prevented developers
from properly signing out of the application during development.
Avoid disabling SSL verification in development environment,
simply mount in the right folder, an extra volume, that declares
the certificate authority necessary to validate nip.io domains.
Offer a standalone dev environment or a dinum specific dev
environment with ProConnect authentication.
Needed to refactor the way secrets are managed in the project,
and also re-organize the Helm chart to make it totally standalone.
Particulary useful for external wanting to run the project.
Work done by @rouja.
