Create proper Camel event source page on Knative website

[christophd]

The Knative documentation uses a very old and obsolete description of the Camel event source. We should update this to reflect Kamelet catalog and a quickstart how to use KameletBindings as event sources in Knative.

Website content: https://knative.dev/docs/eventing/sources/apache-camel-source/

[github-actions[bot]]

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[squakez]

No longer relevant.