Remove some stacks

[mborne]

Actions

Remove the following stacks :

• elasticsearch (-> opensearch)
• kibana (-> opensearch dashboards)
• geonetwork (no more working with metadata)
• nexus (I now use registry:2 as a dockerhub proxy and there are github releases / container registry and equivalent feature in gitlab or gitea)
• openldap (see keycloak or dex)
• vault (licence changed)