chore(examples): update non-monorepo example (#9770)
### Description
Updating the `non-monorepo` example with best practices and latest
dependencies. This was scaffolded using `npx create-next-app@latest` and
then adding `turbo` to it.
### Testing Instructions
`npx create-turbo@latest --example
https://github.com/vercel/turborepo/tree/dependabot/npm_and_yarn/examples/non-monorepo/non-monorepo-cf1be3c1e5/examples/non-monorepo`
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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
