docs: Ionic Variables and Theming

[chiqors]

📚 Is your documentation request related to a problem?

I would like to change themes and css variables from ionic itself. On Ionic/Vue, it generate files ./src/theme/variables.css. But, i couldn't see the configuration in this (maybe, i missed something).

Actually, i would like to set base theme to force using light theme instead of dark by replacing with this @media (prefers-color-scheme: light)

🔍 Where should you find it?

Something in the feature page of the wiki, i guess.

ℹ️ Additional context

Here's the segment code from variables.css

 ....
  --ion-color-light-contrast: #000000;
  --ion-color-light-contrast-rgb: 0, 0, 0;
  --ion-color-light-shade: #d7d8da;
  --ion-color-light-tint: #f5f6f9;
}

@media (prefers-color-scheme: dark) {
  /*
   * -------------------------------------------
   */
...