Save file for theme builder

[Camulos]

Description

For advanced theme builder when the user do a lot of overrides. It would be helpful if it is possible to "save" the theme in a way that allows you to continue later, including your overrides. Example:

• You have built your new theme an selected overrides for 4 colors and also selected base font-size for md to be 20px, and size modifier to be 6.
• You generate your theme in your own repo
• You either get included in the generated files or you can download an save fil
• 3 months later there is new variables and tokens available and you want to continue with your custom theme, but use the theme-builder as a visual tool to make your new overrides, so you either paste your repo-url in a load-function in the theme-builder or upload your save file.

Additional Information

No response

[Barsnes]

Related to #4073, where you can now override colors in the config file.

[Barsnes]

We can make the themebuilder generate a URL from a config file. It will not be feasable for us to read from a repo