World Population Area Chart
This area chart visualizes world population growth over time, with the x-axis representing years and the y-axis displaying population values in billions. The chart uses a maroon filled area beneath a smooth curve to emphasize the accelerating increase in population. Data is loaded from a CSV file and rendered using D3 v5, leveraging `scaleTime`, `scaleLinear`, `area`, `curveBasis`, `axisBottom`, and `axisLeft` APIs. The SVG output includes styled gridlines, tick labels, and custom axis labels, with the title positioned at the top center.