Add pucture(s) of each chart type to website

The official Redash website currently lacks pictures of the charts that Redash can produce.

This is rather surprising, since data visualization is a cornerstone of Redash. It also makes it a bit difficult to “sell” redash to various stakeholders when they can’t really see what it does.

Please add at least one picture or animation of each chart type to the official website.

See this page in the knowledge base. I can add a link to this page to the principal marketing pages since it would be good to have a direct link.