Description
Improvements for job writing guide docs.

• Update Referencing credential secrets in your job code

We don't want to encourage developers to write credentials in job code, Authentication should be handled by the adaptor it self. The current content is bad practices

• Add a debugging section

### Debugging

- Use `console.log()` liberally during development
- Test with small data sets first
- Use the OpenFn CLI to test locally
- Check compiled code with `openfn compile` if needed