update the way the bundle load assets

We use now the standard way to load assets.

See [CHANGELOG.md](CHANGELOG.md) for details.

CHANGELOG.md

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+
+Branch sf3
+==========
+
+- fix the way the bundle compile assets ;
+
+    This modification will require to update Chill-Standard to the latest version.
+    At least, the file `webpack.config.js` should be upgrade [to the last 
+    version](https://framagit.org/Chill-project/Chill-Standard/-/blob/c7a7de68ec49d97c9e1481b72c1f848f9b5cb2d7/webpack.config.js)
+

Resources/public/index.js

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+require('./css/chillevent.css');

chill.webpack.config.js

@@ -1,4 +1,4 @@
-// this file loads all assets from the Chill event bundle
-
-// css
-require('./Resources/public/css/chillevent.css');
+// this file loads all assets from the Chill Event Bundle
+module.exports = function(encore, entries) {
+    entries.push(__dirname + '/Resources/public/index.js');
+};