Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

scripts/webpack/common.js

@@ -0,0 +1,37 @@
+const path = require('path');
+const webpack = require('webpack');
+const StyleLintPlugin = require('stylelint-webpack-plugin');
+
+const rootDir = path.resolve(__dirname, '../../');
+
+module.exports = {
+  entry: {
+    material: path.join(rootDir, './assets/themes/material/index.js'),
+    public: path.join(rootDir, './assets/themes/_global/share.js'),
+  },
+  output: {
+    filename: '[name].js',
+    path: path.resolve(rootDir, 'public/wallassets'),
+    publicPath: '',
+  },
+  plugins: [
+    new webpack.ProvidePlugin({
+      $: 'jquery',
+      jQuery: 'jquery',
+      'window.$': 'jquery',
+      'window.jQuery': 'jquery',
+    }),
+    new StyleLintPlugin({
+      configFile: 'stylelint.config.js',
+      failOnError: false,
+      quiet: false,
+      context: 'assets/themes',
+      files: '**/*.scss',
+    }),
+  ],
+  resolve: {
+    alias: {
+      jquery: path.join(rootDir, 'node_modules/jquery/dist/jquery.js'),
+    },
+  },
+};