[Data viz] Scope work and draft IA for website

[shixiedesign]

IA the Carbon-website Data Visualization section, and scope the amount of work ship-able by October release.

[shixiedesign]

IA of Data visualization section, which will be a left nav item. Black cards are in scope to be done by October, gray cards are not.

Any content going up at this time will be a WIP and to be revised and improved when Accurat team is onboarded. The primary goal of these WIP pages is to give teams a ball-park guidance on the look and few of new carbon-charts, and a place to find & usage the carbon-charts demos.