[IOS CONCEPT] Updated design

@almost-digital suggested me that I should update the design of my concept to remove the "Card" style. Here's an updated version without it, so you can give me more feedbacks about the design.

I plan to begin the development of the app mid-July, until I finalise the design.

You can see my first post here: https://steemit.com/steemit/@maxenceh/concept-native-ios-steemit-app