November / December 2023 update (DONE)

For our Nov / Dec 2023 update, we will upgrade all packages in our `SaaS Boilerplate` book. We will also use functional components and the latest version of Material UI from the beginning of the book.

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Code update: https://github.com/async-labs/saas/commit/855edd159d11a1a5b766d1985ffd304cf3eca2f1