docs: update the docs to use the alchemyTransport

[moldy530]

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 primarily focuses on integrating the alchemy transport within various clients and components of the codebase, replacing the previous method of using API keys directly. This enhances the consistency and maintainability of the code.

Detailed summary

• Added alchemy transport to multiple clients in site/shared/smart-contracts files.
• Updated sidebar items in site/sidebar/reference/account-kit/infra.ts and site/sidebar/reference/account-kit/signer.ts for better navigation.
• Modified transport handling in site/shared/infra/client.ts and related files.
• Enhanced site/pages/third-party documentation with updated examples using alchemy.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 30, 2024 4:06pm
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 30, 2024 4:06pm