Increase base font lightness issue ref #164

Added about 20% lightness based on HSL version of HEX color.

assets/stylesheets/global/variables-dark.scss

@@ -9,7 +9,7 @@ $sidebarMediumWidth: 16rem;
 
 $contentBackground: #2d2d2d;
 
-$textColor: #b4b3af;
+$textColor: #e6e6e5;
 $textColorLight: #7e7d7d;
 $textColorLighter: #6a6868;