Add section overview

source/_docs/ecosystem/certificates.markdown

@@ -0,0 +1,14 @@
+---
+layout: page
+title: "Certificates"
+description: "Protect your communication with Home Assistant."
+release_date: 2016-11-13 15:00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+If you plan to expose your Home Assistant to the internet or want an extra layer of protection in your local network, consider to use SSL/TLS. This way you can protect your communication. Especially sensitive data like usernames and  passwords are encrypted between the endpoints.
+
+Setting up usually requires creating the certificate and configure the [`http`](/components/http/) component.

source/_includes/asides/docs_navigation.html

@@ -177,7 +177,7 @@
             </ul>
           </li>
           <li>
-            Certificates
+            {% active_link /docs/ecosystem/certificates/ Certificates %}
             <ul>
               <li>{% active_link /docs/ecosystem/certificates/tls_self_signed_certificate/ Self-signed certificate %}</li>
               <li>{% active_link /docs/ecosystem/certificates/tls_domain_certificate/ Certificate domain owners %}</li>