chore: update vitepress to 1.0.0-rc.39

[fenghan34]

Description

This PR update vitepress to 1.0.0-rc.39 to fixe the alignment of outline indicator and highlighted link, see vuejs/vitepress#3458 for more details.

Kapture.2024-02-25.at.13.20.37.mp4

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[sheremet-va]

Let's keep a single PR that updates the version at #5483