code: function drawDayLabels() {
              let dayLabelsGroup = svg.select('.day-labels-group');
  
              dayLabels = svg.select('.day-labels-group').selectAll('.day-label')
                  .data(daysHuman);
  
              dayLabels.enter()
                .append('text')
                  .text((label) => label)
                  .attr('x', 0)
                  .attr('y', (d, i) => i * boxSize)
                  .style('text-anchor', 'start')
                  .style('dominant-baseline', 'central')
                  .attr('class', 'day-label');
  
              dayLabelsGroup.attr('transform', `translate(-${dayLabelWidth}, ${boxSize / 2})`);
          }
docs: Draws the day labels