AYS-909 | Format setup guide in markdown and update setup.sh

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[agitrubard]

Bu kısımları başlığı olmadan 91'in altına taşısak ve doğrudan alt madde olarak tanımlasak daha iyi yönlendirebilir

[agitrubard]

Go to, ve if you prefer kısmına da ihtiyaç yok bence

[MenekseYuncu]

If you prefer eklemezsem bu sefer de optional seçenek gibi gözükmüyor.