Docs: Update _index.md (#22979)

docs/sources/_index.md

@@ -26,8 +26,8 @@ aliases = ["/docs/grafana/v1.1", "/docs/grafana/latest/guides/reference/admin",
         <h5>Install on Windows</h5>
     </a>
     <a href="{{< relref "installation/docker.md" >}}" class="nav-cards__item nav-cards__item--install">
-        <h4>Run Docker image</h4>
-        <p>Run Grafana on a Docker image.</p>
+        <img src="/img/docs/logos/icon_docker.png">
+        <h5>Run Docker image</h5>
     </a>
     <a href="https://grafana.com/cloud/grafana" class="nav-cards__item nav-cards__item--install">
         <div class="nav-cards__icon fa fa-cloud">