Make Etherpad react to your systems default settings

For dark mode the following settings apply:

  const nightColors = {
    toolbar: 'dark',
    background: 'super-dark',
    editor: 'dark',
  }

For light mode:

  const dayColors = {
    toolbar: 'super-light',
    background: 'light',
    editor: 'super-light',
  }