docs: add nicole van der hoeven's setup guide

Jacky Zhao

2024-01-26 b87c6cd5c792d90fcd1ee553187af8d5c00980d3

 quartz/components/styles/darkmode.scss

@@ -21,6 +21,14 @@
  }
}

:root[saved-theme="dark"] {
  color-scheme: dark;
}

:root[saved-theme="light"] {
  color-scheme: light;
}

:root[saved-theme="dark"] .toggle ~ label {
  & > #dayIcon {
    opacity: 0;