[Request] Set dark theme as the default

[m4xe-de]

Description

The dark theme is no longer displayed if you use another browser or delete the browser data, because only stored in the browser cache.

Motivation

I have integrated the dashboard into a website with iframe. There it is always loaded in the light theme.

Requirements

Is it possible to make an entry in the config.json, in which the dark theme is set as default?

Thanks

[msarcev]

• Add support for setting the default theme through an env variable defaultTheme.
• Investigate if there is an easy way to pass env variables from node-docker-setup