Improve contrast ratio of H2

Author: hugovk

static/sass/style.css

@@ -781,7 +781,7 @@ h1, .alpha {
   margin-bottom: 0.4375em; }
 
 h2, .beta {
-  color: #999999;
+  color: #222222;
   font-family: SourceSansProRegular, Arial, sans-serif;
   font-size: 1.5em;
   margin-top: 1.3125em;

static/sass/style.scss

@@ -96,7 +96,7 @@ h1, .alpha {
 }
 
 h2, .beta {
-    color: $grey-light;
+    color: $grey-darker;
     font-family: $default-font;
     font-size: px2em( $headertwo );
     @include leader(.75);