Remove HardCoded size as 3 in intro screen.

[prudhvir3ddy]

currently, in onboarding screen it's hardcoded everywhere assuming only 3 screens will be there and even titles, descriptions are also hardcoded

when we want to update, it will be easy for us, if it's list driven.

also creating a model class will help to add every item that's needed.

i'll be working on it.

[boss-contributions-bot]

Thanks @prudhvir3ddy, for raising the issue! 🙌

One of our mentors will revert on this soon. ✅

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