Need specify the color-scheme for dark mode

[LitoMore]

Related PR: #1100

How to reproduce this issue

(Safari does not support this, you need to use Chrome or Firefox to reproduce this issue)

1. Switch to dark mode
2. Modify any img src to https://cdn.simpleicons.org/jsr/yellow/blue in your inspector
3. The image color should be blue, but it's yellow on production

Description

The package readme may include a dynamic color scheme style in the image, like this project's readme: https://github.com/LitoMore/simple-icons-cdn.

This PR fixes a display behavior when the remote image has a prefers-color-scheme inside for dark mode.

Preview

Actual	Expected