code: function getHtmlTemplates(dirName) {
    const html_conf = [];
    // create the array of HTML plugins.
    const template = path.join(dirName, '_template.html');
    getExamples(dirName, (entryName, filename) => {
      html_conf.push(
        new HtmlWebpackPlugin({
          title: entryName,
          // ensure each output has a unique filename
          filename: entryName + '.html',
          template,
          // without specifying chunks, all chunks are
          //  included with the file.
          chunks: ['common', entryName]
        })
      );
    });
    return html_conf;
  }
docs: Each example needs a dedicated HTML file.
  This will create a "plugin" that outputs HTML from a template.
  
  @param {String} dirName - Name of the directory to read.
  
  @returns {Array} specifying webpack plugins.