highlight that generated ddl is optional in sdf

[dbrtly]

Summarize the feature in question.
Sdf should flex harder on its optional "sports-mode" for table ddl. It is uniquely compatible with a model like:

create table hello.world as 
select "Hello, world" as msg

The moms_flower_shop tutorial should start with ddl in the models and then remove it.

What team(s) will benefit from this feature request?
Sdf beginners

Is this an enhancement to an existing feature? If so, briefly describe the update.
Enhance existing tutorial.

Please can contribute this?