Nav back to 555 gray to match the other sites

website/source/assets/stylesheets/_variables.scss

@@ -1,6 +1,7 @@
 // Colors
 $white: #FFFFFF;
 $black: #000000;
+$gray: #555555;
 $gray-darker: #24292e;
 
 $packer-blue: #1DAEFF;
@@ -24,7 +25,7 @@ $body-link-color: $packer-blue;
 
 // Home
 $home-header-background-color: transparent;
-$home-header-link-color: $gray-darker;
+$home-header-link-color: $gray;
 $home-header-link-color-hover: $black;
 
 // Sidebar