Fork of D3 Stacked Barchart Example
This example shows a stacked bar chart where each bar represents a group and is divided into colored segments for three subgroups. The chart loads data from a CSV file hosted on GitHub, then uses `d3.csv` to parse it. The visualization applies `d3.scaleBand` for the x-axis, `d3.scaleLinear` for the y-axis, and `d3.stack().keys()` to stack the data by subgroup. Bars are rendered as SVG `rect` elements, with colors assigned via `d3.scaleOrdinal` using a three-color palette. The y-axis is fixed from 0 to 5, and axes are added with `d3.axisBottom` and `d3.axisLeft`.