fixed css-loader instalation and css import in example files (#1634)

Related to https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md#-breaking-changes

Author: vaukalak

CHANGELOG.md

@@ -18,6 +18,8 @@ Please follow the recommendations outlined at [keepachangelog.com](http://keepac
 ### [Unreleased]
 Changes since the last non-beta release.
 
+#### Fixed
+- Fixed css-loader installation with [PR 1634](https://github.com/shakacode/react_on_rails/pull/1634) by [vaukalak](https://github.com/vaukalak)
 #### Fixed
 - Address a number of typos and grammar mistakes [PR 1631](https://github.com/shakacode/react_on_rails/pull/1631) by [G-Rath](https://github.com/G-Rath)
 

lib/generators/react_on_rails/base_generator.rb

@@ -40,7 +40,8 @@ def copy_base_files
       def copy_js_bundle_files
         base_path = "base/base/"
         base_files = %w[app/javascript/packs/server-bundle.js
-                        app/javascript/bundles/HelloWorld/components/HelloWorldServer.js]
+                        app/javascript/bundles/HelloWorld/components/HelloWorldServer.js
+                        app/javascript/bundles/HelloWorld/components/HelloWorld.module.css]
         base_files.each { |file| copy_file("#{base_path}#{file}", file) }
       end
 
@@ -91,7 +92,7 @@ def add_yarn_dependencies
 
         puts "Adding CSS handlers"
 
-        run "yarn add css-loader css-minimizer-webpack-plugin mini-css-extract-plugin style-loader@"
+        run "yarn add -D css-loader css-minimizer-webpack-plugin mini-css-extract-plugin style-loader"
 
         puts "Adding dev dependencies"
         run "yarn add -D @pmmmwh/react-refresh-webpack-plugin react-refresh"

lib/generators/react_on_rails/templates/base/base/app/javascript/bundles/HelloWorld/components/HelloWorld.jsx

@@ -1,6 +1,6 @@
 import PropTypes from 'prop-types';
 import React, { useState } from 'react';
-import style from './HelloWorld.module.css';
+import * as style from './HelloWorld.module.css';
 
 const HelloWorld = (props) => {
   const [name, setName] = useState(props.name);

lib/generators/react_on_rails/templates/redux/base/app/javascript/bundles/HelloWorld/components/HelloWorld.jsx

@@ -1,6 +1,6 @@
 import PropTypes from 'prop-types';
 import React from 'react';
-import style from './HelloWorld.module.css';
+import * as style from './HelloWorld.module.css';
 
 const HelloWorld = ({ name, updateName }) => (
   <div>