Site ver for Webmaster tools

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)

docs/theme/docker/layout.html

@@ -3,6 +3,7 @@
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="google-site-verification" content="UxV66EKuPe87dgnH1sbrldrx6VsoWMrx5NjwkgUFxXI" />
+    <meta name="google-site-verification" content="XzwpAUE5-gjq6j2F0dDqiBYxCZpHd8uVYe5Fnyt3V8Q" />
     <title>{{ meta['title'] if meta and meta['title'] else title }} - Docker Documentation</title>
     <meta name="description" content="{{ meta['description'] if meta }}" />
     <meta name="keywords" content="{{ meta['keywords'] if meta }}" />