comment some bootstrap imports

assets/css/_bootstrap.scss

@@ -11,21 +11,21 @@
  @import "~bootstrap/scss/tables";
  @import "~bootstrap/scss/forms";
  @import "~bootstrap/scss/buttons";
- @import "~bootstrap/scss/transitions";
+//  @import "~bootstrap/scss/transitions";
 //  @import "~bootstrap/scss/dropdown";
 //  @import "~bootstrap/scss/button-group";
 //  @import "~bootstrap/scss/input-group";
 //  @import "~bootstrap/scss/custom-forms";
  @import "~bootstrap/scss/nav";
  @import "~bootstrap/scss/navbar";
- @import "~bootstrap/scss/card";
+//  @import "~bootstrap/scss/card";
  @import "~bootstrap/scss/breadcrumb";
 //  @import "~bootstrap/scss/pagination";
 //  @import "~bootstrap/scss/badge";
 //  @import "~bootstrap/scss/jumbotron";
- @import "~bootstrap/scss/alert";
+//  @import "~bootstrap/scss/alert";
 //  @import "~bootstrap/scss/progress";
- @import "~bootstrap/scss/media";
+//  @import "~bootstrap/scss/media";
  @import "~bootstrap/scss/list-group";
  @import "~bootstrap/scss/close";
 //  @import "~bootstrap/scss/toasts";