readme: unclear Ingestion Use Case description

[sdashet]

Under the ingestion use cases: pre-ingestion: "Enterprise documents are pre-processed and ingested into the system for later querying via OpenShift AI/Kubeflow Pipelines." The Querying is done using the Chat UI or in other cases by other agentic applications rather by KF pipeline or OpenShift AI

[sdashet]

What does it mean into the system? Into the vector db? into minio?