Add favicon switch

Aleksandr Gumroianrequested to merge
switch-favicon into master

Add a favicon switch if the browser is using dark mode with help of the prefers-color-scheme CSS media query feature.

ezgif-3-98d0d20ce983

You can read how to debug prefers-color-scheme in Chrome DevTools here.

Closes: #11 (closed)

Edited by Aleksandr Gumroian

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