docs: fix benchmark link

[avarobinson]

https://app.asana.com/0/1205598840815267/1208555303049565

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)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR updates the sidebar/smart-contracts.ts and choosing-a-smart-account.mdx files to modify the link for "Gas benchmarks" and adds information about account deployment gas costs.

Detailed summary

• Updated the link for "Gas benchmarks" in sidebar/smart-contracts.ts from a local path to a GitHub link.
• Added a note about considering account deployment gas costs in choosing-a-smart-account.mdx.

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