message: Add explore link test
diff: @@ -9,7 +9,12 @@ header.LoggedOutHeader.js-logged-out-header
  .LoggedOutHeader__menu
  a( href='/pricing' data-id="pricing" ) Pricing
  +
  + if sd.EXPLORE_LINK == 'explore'
  a( href='/explore' data-id="explore" ) Explore
  + else
  + a( href='/examples' data-id="examples" ) Examples
  +
  a( href='/blog' data-id="blog" ) Blog
  if user
  