docs(rn): fix peer deps and remove alpha callouts

[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)
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PR-Codex overview

This PR focuses on updating documentation and code examples related to the usage of @account-kit libraries, specifically enhancing the useAuthContext hook, modifying middleware imports, and refining project setup instructions for React Native and Expo.

Detailed summary

• Updated code block syntax in useAuthContext.mdx to twoslash.
• Changed middleware import from alchemyErc7677Middleware to alchemyGasManagerMiddleware in alchemyGasManagerMiddleware.mdx.
• Renamed react-native.config.json to react-native.config.js in package.json.
• Updated peer dependency versions for react and react-native in package.json.
• Added instructions for creating a new Expo project in getting-started-expo.mdx.
• Modified warning about the Alchemy Signer in overview.mdx to a tip recommending Expo for new projects.

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[moldy530]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• docs(rn): fix peer deps and remove alpha callouts #1300 👈 (View in Graphite)
• docs: update the docs sidebar to treat RN as a first class citizen #1285 : 6 other dependent PRs (#1286 , #1293 , #1303 and 3 others)
• main

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