This fork of Hello VizHub shows Bitcoin's price over time as an area chart with an overlaid line, using a semi-transparent steelblue fill and a darkblue stroke. It loads a CSV file from a GitHub gist, parses dates with `d3.timeParse`, and creates time and linear scales with `d3.scaleTime` and `d3.scaleLinear`. The chart is rendered as SVG using `d3.area`, `d3.line`, and `d3.axisBottom`/`d3.axisLeft`, with labeled axes and a title.