Different color palettes for the theme (light/dark mode)

[AmanRathoreP]

I had recentlly create a site with hugo and I had update the default color palette to blue. After +ve response from @gleb-kun I decided to add this feature to hugo too for ease of use and customizability.
Currently, I had replaced variables.scss with palettes/common.scss and palettes/default.scss(and palettes/blue.scss)
I would like have suggestions for the same.

Example site: amanr.me, example post
Updated code: hugo-dev
Future palettes: pink, red, yellow, high contrast, etc.