fix: Delete `CreateProduct.ts` and `index.ts` files

[glaucia86]

@diberry , @juliamuiruri4 probably forgot to remove those files in the main branch.

As the purpose of Learn is precisely to teach you how to create a function, I removed the following files:

• CreateProduct.ts
• index.ts

I ask you to check this Pull Request if it now makes sense for what is requested in Learn.