Deploy without sourcemaps

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 )