fix: skeleton.css for both dev and prod

scss/core/core.scss

@@ -1,16 +1,11 @@
+@use "~react-loading-skeleton/dist/skeleton";
 @import "functions";
 @import "variables";
 @import "~bootstrap/scss/mixins";
 @import "~bootstrap/scss/root";
 @import "~bootstrap/scss/reboot";
 @import "typography";
 @import "grid";
-// The react-loading-skeleton package.json defines an 'exports' field which specifies a '.css'
-// extension on this export.  Without the '.css' on the end of this line, webpack can't find the file
-// and the build fails.
-// See https://webpack.js.org/guides/package-exports/ for more information on how webpack uses
-// the 'exports' field.
-@import "~react-loading-skeleton/dist/skeleton.css";
 @import "~bootstrap/scss/transitions";
 @import "utilities";
 @import "~bootstrap/scss/media";