Update courses landing page sales copy

app/templates/courses/mock1/courses.jade

@@ -56,8 +56,12 @@ block content
   .info-container
     //- p.center.gameplay-img-container
     //-   img(src="/images/pages/courses/101_info.png" width='800')
-
+    p A course is a selection of CodeCombat levels designed to introduce computer science concepts in a fun and engaging environment.
     .container-fluid
+      .row
+        .col-md-12
+          p.center
+            button.btn.btn-success.btn-lg.btn-buy Enroll Now!
       .row
         .col-md-6
           div With CodeCombat courses, you and your students will:
@@ -70,10 +74,6 @@ block content
           p
             div.praise-quote "#{praise.quote}"
             div.caption-text - #{praise.source}
-      //- .row
-      //-   .col-md-12
-      //-     div.center
-      //-       button.btn.btn-success.btn-lg.btn-buy Enroll Now!
 
   //- h2.center Available Courses