Move implicit to root-level in REPL.
Move implicit to root-level in REPL.

'tut' showed the following error when I had run: 'tutOnly testing.md':

// <console>:45: error: User.type does not take parameters
//          def find(id: String): IO[Option[User]] = IO.pure(Some(User("johndoe", 42)))
//

As a result, I wasn't sure how else to define the implicit Encoder than by
moving it outside of the User's companion objec'tut' showed the following error when I had run: 'tutOnly testing.md':

// <console>:45: error: User.type does not take parameters
//          def find(id: String): IO[Option[User]] = IO.pure(Some(User("johndoe", 42)))
//

As a result, I wasn't sure how else to define the implicit Encoder than by
moving it outside of the User's companion objectt

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