setTitle(title) {
    this.svg
      .append("text")
      .attr("x", this.width / 2)
      .attr("y", 0 - this.margin.top / 2)
      .attr("class", "title")
      .attr("text-anchor", "middle")
      .style(
        "font-size",
        this.titleFontSize === undefined
          ? `${Math.min(40, Math.min(this.width, this.height) / 5)}px`
          : this.titleFontSize
      )
      .style("font-family", this.fontFamily)
      .style("opacity", 0.8)
      .text(title);
  }
Set the chart title with the given title.
@param {string} title - The title for the chart.