Update Confluent flavored tutorials Production section w/ a more thorough config for Confluent Cloud

The current `Confluent` tutorials give a sparse configuration, like
```
bootstrap.servers=

key.serializer=org.apache.kafka.common.serialization.StringSerializer
value.serializer=org.apache.kafka.common.serialization.StringSerializer
acks=all

#Properties below this line are specific to code in this application
input.topic.name=
output.topic.name=
```

But this is missing example values for a valid production deployment _to confluent cloud_. This issue tracks updating the `Confluent` tutorials to provide the reader a better "stub" configuration file that contains required Confluent Cloud values.