Update docs to remove deprecated `create-react-app` reference

[brandonmcconnell]

create-react-app has been officially deprecated.

The official recommendation is to use a full-stack framework instead, like one of the below:

• Next.js (App Router)
  npx create-next-app@latest
• React Router (v7)
  npx create-react-router@latest
• Expo (for native apps)
  npx create-expo-app@latest
• TanStack Start (Beta)
  npx degit https://github.com/tanstack/router/examples/react/start-basic start-basic
• RedwoodJS
  yarn create redwood-app my-redwood-project

Another solid and configurable battle-tested option that can create Next.js projects is create t3-app, which can be used via this command: npm create t3-app@latest (more info on that @ create.t3.gg)