Thanks for the PR. However, 22 files changed for such a simple change doesn't look right. Please check and remove all unnecessary changes that are not necessary for the proposed change.

Thank you for your quick review. I had added all the npm-built files, sorry for bothering you.

I reverted the first commit and added the necessary changes. If you prefer a clean history, I would squash these commits and force push.

Thanks for the PR! However, I think it's a better idea if we automatically set indigo as a color when none is provided, effectively removing the "empty" value which you fixed in this PR. Fixed in 6fe1d55.

As an addendum: the only downside of this approach is that you now need to be explicit when using multiple color palettes:

theme:
  palette: 

    # Palette toggle for light mode
    - scheme: default
      primary: red
      accent: red

    # Palette toggle for dark mode
    - scheme: slate
      # The following settings are now the default, but were priorly inherited from the default scheme,
      # which means that the slate theme would also use red for both values.
      # primary: indigo
      # accent: indigo

IMHO being more explicit is better than too much magic.