Add symlink to wai-perspective-videos VTT metadata

[remibetin]

Preview: https://deploy-preview-364--wai-website.netlify.app/perspective-videos/

Context:

• https://github.com/w3c/wai-translations/issues/117
• Needed to merge https://github.com/w3c/wai-perspective-videos/pull/43

[netlify[bot]]

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