refactor: remove pace

Author: mrholek

scss/coreui-standalone.scss

@@ -41,7 +41,6 @@
 @import "grid";
 @import "images";
 @import "input-group";
-@import "loading";
 @import "modal";
 @import "nav";
 @import "navbar";

scss/coreui.scss

@@ -39,7 +39,6 @@
 @import "grid";
 @import "input-group";
 @import "images";
-@import "loading";
 @import "list-group";
 @import "modal";
 @import "nav";