Added custom summary support (optional)

If use passed customSummary it will appear bellow Page URL:

        const customSummary = `Test Case: Full page analysis
        <br>Steps:</br>
        <ol style="margin: 0">
        <li>Open https://dequeuniversity.com/demo/mars/</li>
        <li>Analyze full page with all rules enabled</li>
        </ol>`;
        createHtmlReport({
            violations: axeRawViolations,
            url: 'https://dequeuniversity.com/demo/mars/',
            customSummary
        });