dist version addon-info should not require user's webpack css loader

Describe the bug When upgrading to @storybook/addon-info 5.1.9 I receive the following error:

ERROR in ./node_modules/@storybook/addon-info/dist/components/PropTable/style.css 1:0
Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
> .info-table {
|   width: 100%;
| }
 @ ./node_modules/@storybook/addon-info/dist/components/PropTable/components/Table.js 14:0-23

To Reproduce This is most likely caused because I have the following rule defined in my webpack.config.js:

      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader'],
      },

Note that node_modules is excluded. This is a very common config but unfortunately it means webpack won’t be processing anything inside of shipped npm modules.

Expected behavior There is an expectation that anything shipped as dist within an npm module should already be compiled and not rely on the user’s version of webpack in order to run. There are serious performance and bundle size issues that require node_modules to be excluded. This is the expected contract that all npm modules normally follow.

[brennancheung]

I worked around the issue by excluding just @storybook/addon-info from the exclude.

      {
        test: /\.css$/,
        exclude: /node_modules(?!\/@storybook\/addon-info)/,
        use: ['style-loader', 'css-loader'],
      }

[ellisio]

I was able to resolve this by modifying our webpack.config.js to be the following:

const path = require('path');
const autoprefixer = require('autoprefixer');

module.exports = async ({ config }) => {
  config.module.rules = config.module.rules.map(f => {
    // Needed to add this to ignore our ../src/ for the default rule, instead of purging it.
    if (f.test.toString() === '/\\.css$/') {
      f.exclude = path.resolve(__dirname, '../src/');
    }

    return f;
  });

  config.module.rules.push({
    test: /\.css$/,
    include: path.resolve(__dirname, '../src/'), // Needed to be changed from ../
    loaders: ['style-loader', 'css-loader', 'postcss-loader'],
  });

  return config;
};
```****