Improve the build process by removing unused files that are published to NPM

[shortcut-integration[bot]]

This pull request has been linked to Clubhouse Story #160572: Improve the build process by removing unused files that are published to NPM.

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[borja-munoz]

Please check if the files mentioned in this issue: https://github.com/CartoDB/carto-react-template/issues/230 should be removed

[aaranadev]

Yes