fix: removing rewrite to fix dashboard link

[avarobinson]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
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PR-Codex overview

This PR updates the hostname in the VitePress configuration file and removes a rewrite rule.

Detailed summary

• Updated hostname to "https://accountkit.alchemy.com"
• Removed rewrite rule for "getting-started/overview.md"

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