Remove unused getUser

[2wheeh]

getUser implementation got moved to @app/lib/data:

• Add basic metadata and update OG image #212

However, during the update of auth.ts, somehow getUser got decided to retained in auth.ts (which might be a result of a git conflict or intended to bundle seperatly)

• feat: update to next-auth v5 #219

and the one that moved in @app/lib/data was not removed.

1. getUser in the @app/lib/data is no longer in use.
2. Chapter 15 describes upon the one in auth.ts

Therefore, shouldn't we remove the unused one left in @app/lib/data unless it was unintentional ?
or we could consider removing the one in auth.ts with updating Chapter 15 mdx (don't forget to update type assertion to generic.)

In any case, one of them should be removed.

Thank you for the amazing course.

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