Temporarily revert the sass.json features from 9aeadf2 because heft-sass-plugin is not quite ready yet

Author: octogonz

rigs/heft-web-rig/profiles/app/config/sass.json

@@ -40,7 +40,7 @@
    *
    * Default value: undefined
    */
-  "cssOutputFolders": ["lib", "lib-commonjs"],
+  // "cssOutputFolders": ["lib", "lib-commonjs"],
 
   /**
    * Files with these extensions will pass through the Sass transpiler for typings generation.

rigs/heft-web-rig/profiles/library/config/sass.json

@@ -40,7 +40,7 @@
    *
    * Default value: undefined
    */
-  "cssOutputFolders": ["lib", "lib-commonjs"],
+  // "cssOutputFolders": ["lib", "lib-commonjs"],
 
   /**
    * Files with these extensions will pass through the Sass transpiler for typings generation.

rigs/heft-web-rig/shared/webpack-base.config.js

@@ -69,7 +69,7 @@ function createWebpackConfig({ env, argv, projectRoot, configOverride }) {
           //
           // COMPILATION STRATEGY
           //
-          // - Sass compilation:   handled by @rushstack/heft-sass-plugin, configured using config/sass.json
+          // - Sass compilation:   handled by Webpack
           // - .d.ts generation:   handled by @rushstack/heft-sass-plugin, configured using config/sass.json
           // - Autoprefixer:       handled by Webpack
           // - CSS modules:        handled by Webpack
@@ -177,6 +177,20 @@ function createWebpackConfig({ env, argv, projectRoot, configOverride }) {
                       ]
                     },
 
+                    sourceMap: !production
+                  }
+                },
+                {
+                  // Compiles SASS syntax into CSS
+                  // https://www.npmjs.com/package/sass-loader
+                  loader: require.resolve('sass-loader'),
+
+                  options: {
+                    implementation: sass,
+                    sassOptions: {
+                      includePaths: [path.resolve(__dirname, 'node_modules')]
+                    },
+
                     sourceMap: !production
                   }
                 }