Change /kafka to Historical

[xmulligan]

Repository URL

https://github.com/cilium/kafka

Current Scope

Ecosystem

Proposed Scope

Historical

Motivation for Request

Almost 10 years since the last update and Kafka support is being deprecated https://github.com/cilium/cilium/issues/38224. Maybe time to archive?

Code of Conduct

• I agree to follow Cilium's Code of Conduct

To be filled by a Cilium committer

• Approved change of scope is reflected in REPOSITORIES.md