Created by: simonewebdesign
Since we have two very similar colors, #f5f5f5 and #f7f7f9, I'd propose to just use the first one -- so this PR replaces every occurrence of #f7f7f9 with $gray-lightest.
Also, since we are not using $gray-lightest anywhere apart from here, I guess it would make sense to either remove it, or start using it somewhere else.
Thoughts?