clean up main.scss, change primary color as example

server/app/assets/stylesheets/base/_variables.scss

-$primary: red;
+$primary: #428bca;

server/app/assets/stylesheets/main.scss

@@ -8,7 +8,6 @@ $fa-css-prefix: fa;
 @import "lib/bootstrap/scss/bootstrap.scss";
 
 @import "lib/play-cms/frontend/css/sortable";
-@import "lib/play-cms/stylesheets/main.css";
 
 img {
   display: block;