Merge pull request #506 from GSA/update-uswds-style-reference

Directly refer to node_modules when importing uswds

Author: Bibek-Regmi

src/stylesheets/sam.scss

@@ -4,6 +4,6 @@
 *******************************/
 
 @import './theme/styles';
-@import '~uswds/dist/scss/uswds';
+@import 'node_modules/uswds/dist/scss/uswds';
 @import './elements/index';
 @import './components/index';