create hero section

[rhyn0bytes]

Create hero section with moving mountain css animation

https://www.figma.com/file/KwZFEaLN4u9Uids0Xjjt2J/Code-For-Denver-Website-Redesign-'20?node-id=819%3A0

[rhyn0bytes]

@ostrikovartem can we make the animation run once from behind the mountains up in the sky and stay there?

If not can we make the animation match the timing of the figma example on repeat? https://www.figma.com/proto/KwZFEaLN4u9Uids0Xjjt2J/Code-For-Denver-Website-Redesign-'20?node-id=832%3A430&scaling=scale-down