New default template design

[thymikee]

Describe the feature

Implement new design for the default template. Make sure to use platform-native fonts and base64 icons to avoid assets pollution. Make it as a separate package so we can import it as a component in App.ts:

import { Home as HomeIOS } from '@rnef/platform-ios';
import { Home as HomeAndroid } from '@rnef/platform-android';
import { Platform } from 'react-native;

export function App() {
  const Home = Platform.select({
    ios: HomeIOS,
    android: HomeAndroid
  })
  return <Home />
}