docker/l3d#74 Move all documentation to devops-tools doc

README.md

-Links to configure Keycloak/Nextcloud integration:
+# Keycloak
 
-- https://stackoverflow.com/questions/48400812/sso-with-saml-keycloak-and-nextcloud
-- https://stackoverflow.com/questions/51011422/is-there-a-way-to-filter-avoid-duplicate-attribute-names-in-keycloak-saml-assert
+You find all the details in the [full documentation](https://devops-tools.docs.lakedrops.com/ansible/roles/keycloak/).