fix css rules excludes

demo/playground/webpack.config.d/01.ring.js

@@ -1,4 +1,5 @@
 const ringConfig = require('@jetbrains/ring-ui/webpack.config').config;
+const path = require('path');
 
 config.module.rules.push(...ringConfig.module.rules)
 
@@ -6,7 +7,7 @@ config.module.rules.push(
     {
         test: /\.css$/,
         exclude: [
-            'D:\\Work\\Projects\\visionforge\\build\\js\\node_modules\\@jetbrains\\ring-ui'
+            path.resolve(__dirname, "../../node_modules/@jetbrains/ring-ui")
         ],
         use: [
             {