Incorporate Hatun's mobile design in the landing page mobile view

[hantuzun]

Hatun's mobile design should be used in the mobile view's hero section. Except the button and tab placements.

The sections on the bottom are not aligned.

[hantuzun]

Use lazy loading so that mobile users won't need to load the assets for larger views. Documentations:

• https://reactjs.org/docs/code-splitting.html
• https://blog.logrocket.com/lazy-loading-components-in-react-16-6-6cea535c0b52/
• https://stackoverflow.com/questions/41478875/creating-different-mobile-layout-for-a-component-in-reactjs