[Bug]: Correct unsuscribe emails (dev and user mailing lists)

[KomiB-Atsou]

What happened?

Page : https://beam.apache.org/community/contact-us/ Paragraph Title : Subscribe and Unsubscribe:

The mail used in unsuscribe links is dev-subscribe@beam.apache.org. The correct mail is user-unsubscribe@beam.apache.org and dev-unsubscribe@beam.apache.org

Issue Priority

Priority: 3 (minor)

Issue Components

• [ ] Component: Python SDK
• [ ] Component: Java SDK
• [ ] Component: Go SDK
• [ ] Component: Typescript SDK
• [ ] Component: IO connector
• [ ] Component: Beam YAML
• [ ] Component: Beam examples
• [ ] Component: Beam playground
• [ ] Component: Beam katas
• [X] Component: Website
• [ ] Component: Spark Runner
• [ ] Component: Flink Runner
• [ ] Component: Samza Runner
• [ ] Component: Twister2 Runner
• [ ] Component: Hazelcast Jet Runner
• [ ] Component: Google Cloud Dataflow Runner

[KomiB-Atsou]

.take-issue