docs: README lists email draft as default output but config disables it

[CevenJKnowles]

Description

The README lists a console email draft as a default output. However
config.example.json has generate_email: false.

On baseline testing the email draft was generated, suggesting the config
default may not be loading correctly or the README and config are out of sync.

Suggested Fix

Clarify the default behaviour and align README with config.example.json.

Noted during testing in PR #11.