feat(style): improve links style in dark mode

[chenjiahan]

Summary

Improve all links style in dark mode.

For link elements, there is new --rp-c-link CSS variable, which use --rp-c-brand-dark in the light mode, and use --rp-c-brand-light in the dark mode. It provides contrast with the background.

• before:

• after:

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[SoonIter]

beautiful react blue in the dark 👍🏻