Flesh out reflection on how the course is relevant in lesson 4

[40thieves]

https://docs.codeyourfuture.io/fundamentals/lessons/lesson-3#reflection-zombies-plants-fish-tanks-draw-function-how-is-all-this-relevant-in-the-real-world

Should be approximately 15 - 20 minutes. Goal is to relate what students have learnt on the course to the "real world" of programming.

May be useful to go through the concept roadmap.