Deploy without sourcemaps

[purplecabbage]

We always deploy the frontend with source-maps and these are typically the largest files in the deploy.
Front end deploys could be much faster if we defaulted to NOT building them, but we should still provide a flag to override this behavior.

Note that the source-maps are created by the bundler during build, and deploy simply pushes everything to S3, implying that the deploy a flag as it calls build ( except with --no-build )

[aiojbot]

JIRA issue created: https://jira.corp.adobe.com/browse/ACNA-2646