Commit Statistic repository charts styling and accessibility improvements

Summary

Improvements

  1. Make chart accessible by meeting color audit standards - specifically color contrast: https://www.w3.org/WAI/fundamentals/accessibility-principles/#distinguishable

Distinguishable content is easier to see and hear. Such content includes: Default foreground and background color combinations provide sufficient contrast

  1. Change grey to color for visual interest (chart's currently look like they're placeholder or disabled)
  2. Increase width of columns so charts are easier to consume and numbers are not squished (especially monthly x axis values).

Screenshots

Screen_Shot_2019-05-22_at_11.51.34_AM

Edited by Shane Bouchard