Include CSS files when copying files with Encore (#177)

docs/installation.rst

@@ -66,20 +66,24 @@ You can by running this command:
     # if you are using Yarn as package manager
     $ yarn add ckeditor@^4.0.0
 
-Once installed, add the following lines to your Webpack Encore configuration file:
+Once installed, add the following lines to your Webpack Encore configuration file (this excludes the samples directory from the ckeditor node module):
 
 .. code-block:: javascript
 
     // webpack.config.js
+    var path = require('path');
     var Encore = require('@symfony/webpack-encore');
 
     Encore
         // ...
         .copyFiles([
-            {from: './node_modules/ckeditor/', to: 'ckeditor/[path][name].[ext]', pattern: '/\.js$/'},
+            {from: './node_modules/ckeditor/', to: 'ckeditor/[path][name].[ext]', pattern: /\.(js|css)$/, includeSubdirectories: false},
+            {from: './node_modules/ckeditor/adapters', to: 'ckeditor/adapters/[path][name].[ext]'},
             {from: './node_modules/ckeditor/lang', to: 'ckeditor/lang/[path][name].[ext]'},
+            {from: './node_modules/ckeditor/plugins', to: 'ckeditor/plugins/[path][name].[ext]'},
             {from: './node_modules/ckeditor/skins', to: 'ckeditor/skins/[path][name].[ext]'}
         ])
+        .addLoader({test: /\.json$/i, include: [path.resolve(__dirname, 'node_modules/ckeditor')], loader: 'raw-loader', type: 'javascript/auto'})
     ;
 
 Then, override the bundle's configuration to point to the new CKEditor path: