Remove Sprockets require statements

app/webpacker/css/darkswarm/all.scss

@@ -1,13 +1,6 @@
-/*
-   * This is a manifest file that'll automatically include all the stylesheets available in this directory
-   * and any sub-directories. You're free to add application-wide styles to this file and they'll appear at
-   * the top of the compiled file, but it's generally better to create a new file per style scope.
 
-   *= require autocomplete
-   *= require leaflet
-
-   *= require_self
-*/
+@import 'autocomplete';
+@import 'leaflet';
 @import 'variables';
 @import '../shared/variables/layout';
 @import '~foundation-sites/scss/foundation';