Specify sitemap on robots.txt

[JayJay1024]

PR-Codex overview

This PR adds a Sitemap directive to the robots.txt file for search engine optimization.

Detailed summary

• Added Sitemap: https://helixbridge.app/sitemap.xml directive to robots.txt

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Latest commit: 051834f

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[github-actions]

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Commit: 051834f
Preview: https://helix-apps-jw6skrwzv-itering.vercel.app https://helix-dev-mainnet.vercel.app

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Commit: 051834f
Preview: https://helix-apps-test-ia7nt1ful-itering.vercel.app https://helix-dev-testnet.vercel.app