feat(build): add gzip to serve --prod

[filipesilva]

Fix #2028

[grizzm0]

Wouldn't it be a better idea to support the --compress argument to make this optional instead of forcing gzip in prod?

[filipesilva]

@grizzm0 we don't offer a lot of customization on the set of transformations so I don't see when the use of compression should be a decision point (or why it should be while others aren't).

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