Add reference to netlify in the website

In an effort to apply for OSS license of Netlify:
https://www.netlify.com/legal/open-source-policy

Signed-off-by: Daniel Jiang <daniel.jiang@broadcom.com>

site/layouts/_default/footer.html

@@ -43,7 +43,7 @@
                 © {{ now.Format "2006" }} {{ .Site.Params.Author }}.
                 <a href="{{ .Site.Params.footer.vm_link }}" class="vm-logo">A VMware-backed project. <img
                             src="/img/{{ .Site.Params.vm_logo }}" alt="VMware logo"/></a>
-                <br/>This Website Does Not Use Cookies or Other Tracking Technology<br/><br/>
+                <br/>This Website Does Not Use Cookies or Other Tracking Technology.  This site is powered by <a href="https://www.netlify.com">Netlify</a>.<br/><br/>
                 <span>
                     <a target="_blank" rel="noopener" href='https://www.vmware.com/help/legal.html'>Terms of Use</a> |
                     <a target="_blank" rel="noopener" href='https://www.vmware.com/help/privacy.html'>Privacy Policy</a> |