[docs] Light theme accent color does not meet a11y

[leerob]

Describe the bug

First off, I really like the new documentation theme. This is a minor complaint, although it probably affects some users more than others.

The link color var(--ifm-link-color) has a contrast ratio of 1.92. This does not meet AA contrast requirements.

Steps to reproduce

1. Visit https://create-react-app.dev/docs/getting-started/
2. Inspect a link element via dev tools

Expected behavior

Contrast should meet AA requirements (it does in dark mode).

Actual behavior

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