Use functions in episode 4

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:stopwatch: Updated at 2023-08-07 09:08:18 +0000

[svenvanderburg]

I agree that the create_nn function does not add as much as the plot_history and compile_model functions. However, I do think that it shows good practice and conceptually puts all network creation code in one function which makes the explanation a bit easier I think. And it is in line with the other episodes.