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

README.md

-# Setup SAML with Keycloak
+# Nextcloud
 
-Follow [this guide](https://rmm.li/wiki/doku.php?id=linux_server_manuals:nextcloud_saml_authentication_against_keycloak) and pay attention to these:
-
-- To map existing users, make sure that the username in Keycloak and Nextcloud is the same
-- In Nextcloud disable the option that the NameID response needs to be encrypted
-- For monitoring, use the URL https://domain/index.php/login?direct=1
+You find all the details in the [full documentation](https://devops-tools.docs.lakedrops.com/ansible/roles/nextcloud/).