Added scripts

- New packages for css processing
- Added index for browser-sync

postcss.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  plugins: [
+    require('autoprefixer')({
+      env: '>= 4%, last 2 version'
+    }),
+    require('cssnano')({
+      preset: 'default',
+    }),
+  ],
+};