Scaling Up with Reducer and Context

URL - https://te-react-dev.vercel.app/learn/scaling-up-with-reducer-and-context
Requires modification to [src/content/learn/scaling-up-with-reducer-and-context.md](https://github.com/reactjs/te.react.dev/tree/main/src/content/learn/scaling-up-with-reducer-and-context.md) this file.

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