[Feature] Update Zendesk references in README to Zendesk Support

Is there an existing feature request for this?

[X] I have searched the existing issues

Describe the Feature

In the documentation of this package (and the source package) we reference the "Zendesk" connector. However, there is a legacy "Zendesk Chat" connector. We should update the references in the README to mention "Zendesk Support" so it is clear which Fivetran connector this is designed around.

Describe alternatives you've considered

No response

Are you interested in contributing this feature?

[ ] Yes.
[ ] Yes, but I will need assistance and will schedule time during your office hours for guidance.
[ ] No.

Anything else?