part6b-c - Exercise 6.10 requests a task that is only explained after the exercise

[mirdevilar]

Not sure if this is intentional to "challenge" the student, but exercise 6.10 (in part 6b) asks the student to extract the store setup from main.jsx into store.js.
However, this step is only shown and made in the "notes" theory app after the exercise, well into part6c.