Silence build warnings (#657)

Author: bmunkholm

src/crate/theme/rtd/crate/static/css/ng/furo.scss

@@ -8,10 +8,10 @@
 **/
 
 // Import Furo's variables.
-@import "../../vendor/furo/styles/variables/layout";
+@use "../../vendor/furo/styles/variables/layout" as *;
 
 // Import Furo's components.
-@import "../../vendor/furo/styles/components/footer";
+@use "../../vendor/furo/styles/components/footer";
 
 // Sidebar: When primary sidebar is not collapsed, show its
 // content above all others.

src/crate/theme/rtd/crate/static/css/ng/index.scss

@@ -1,4 +1,4 @@
-@import "settings";
-@import "layout";
-@import "furo";
-@import "page-tools";
+@use "settings";
+@use "layout";
+@use "furo";
+@use "page-tools";

webpack.config.js

@@ -13,7 +13,17 @@ module.exports = {
                   { loader: "style-loader" },
                   { loader: "css-loader", options: { sourceMap: true } },
                   { loader: "postcss-loader", options: { sourceMap: true } },
-                  { loader: "sass-loader", options: { api: "legacy", sourceMap: true } },
+                  {
+                    loader: "sass-loader",
+                    options: {
+                      api: "modern-compiler",
+                      sourceMap: true,
+                      sassOptions: {
+                        // TODO: Remove this again when Furo theme has been fixed
+                        silenceDeprecations: ['import', 'global-builtin']
+                      }
+                    }
+                  },
                 ],
             },
             {