chore: add noindex to token page seo

[blushi]

Description

Closes: regen-network/rnd-dev-team#1766

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Author Checklist

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I have...

• provided a link to the relevant issue or specification
• provided instructions on how to test
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• confirmed all CI checks have passed

How to test

Inspect https://deploy-preview-2068--regen-website.netlify.app/token header and verify noindex is defined for robots meta

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• confirmed all author checklist items have been addressed
• reviewed code correctness and readability
• verified React components follow DRY principles
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• reviewed tests
• manually tested (if applicable)

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