[Encore] Add docs on how to add extra webpack config #8067
Description
Encore doesn't support adding all of Webpack's options... because many are easy enough for you to add yourself. For example (from symfony/webpack-encore#35), if you want to add watchOptions, I think we should encourage you to add those yourself:
// webpack.config.js
var Encore = require('@symfony/webpack-encore');
// all Encore config here
var config = Encore.getWebpackConfig();
config.watchOptions = { poll: true, ignored: /node_modules/ };
module.exports = config;