Fix deprecation warnings for @import statements

Author: tvdijen

resources/css/default.scss

@@ -1,8 +1,8 @@
+@use "sass:meta";
 @import "../../node_modules/reset-css/reset.css";
 @import "../../node_modules/purecss/build/pure.css";
-$fa-font-path: '../fonts';
-@import "../../node_modules/\@fortawesome/fontawesome-free/scss/fontawesome";
-@import "../../node_modules/\@fortawesome/fontawesome-free/scss/solid";
+@include meta.load-css("../../node_modules/@fortawesome/fontawesome-free/scss/fontawesome", $with: ("fa-font-path": "../fonts"));
+@include meta.load-css("../../node_modules/@fortawesome/fontawesome-free/scss/solid", $with: ("fa-font-path": "../fonts"));
 @import "../../node_modules/highlight.js/styles/base16/zenburn.css";
 
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