Don't include development assets in Python package

Is your feature request related to a problem? Please describe.

The dash-renderer sdist on PyPI is quite big large (2.3M compressed, 10M uncompressed) compared to the actual required components. This is due to at least the following files that shouldn't be required:

• dash_renderer.dev.js (3.9M)
• dash_renderer.dev.js.map (4.5M)
• dash_renderer.min.js.map (1.3M)

Describe the solution you'd like

Don't distribute files for development purposes in release artifacts. This would reduce the size of the package to 1/10 (200K compressed, 720K uncompressed).

Describe alternatives you've considered

As an alternative to not shipping the debug maps at all, you could also distribute them as separate -dbg packages. This would enable a user to get debug information but not having these files in all installations. This requires a lot more effort though.

Beginne damit, zu ermitteln, wie das Python-Paket dash-renderer sein Release-Artefakt erstellt und wo dash_renderer.dev.js, dash_renderer.dev.js.map und dash_renderer.min.js.map enthalten sind. Erstelle ein Paket ohne Entwicklungs-Assets und überprüfe, dass die resultierende sdist die erforderlichen Runtime-Dateien enthält und wesentlich kleiner ist.