[Feature] Update README to reflect new pre built report flow

Is there an existing feature request for this?

[X] I have searched the existing issues

Describe the Feature

Recently the Facebook Ads connector was updated to have the creation of the pre built reports take place in the schema tab as opposed to the connector settings. Since our README in this package as well as the source package references the old setup flow, we will want to update this to be consistent with the latest workflow available in the connector.

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?