docs: change support page to a list layout (#284)

Signed-off-by: Floor Drees <floordrees@gmail.com>
Co-authored-by: Jaime Silvela <jaime.silvela@enterprisedb.com>

Author: FloorD

content/support/_index.md

@@ -1,6 +1,6 @@
 ---
 Title: Commercial Support
-type: paged_content
+type: support
 ---
 
 **CloudNativePG** is an independent open-source project and does not endorse

layouts/support/list.html

@@ -0,0 +1,13 @@
+{{ define "main" }}
+
+<div class="mx-auto md:w-1/2 px-4 well">
+    <h2 class="text-xl mt-6">{{.Title}}</h2>
+    <p>{{.Content}}</p>
+    <ul>
+    {{ range sort .Pages "Title" }}
+        <li><a href="{{ .Params.homepage }}">{{ .Title }}</a></li>
+    {{ end }}  
+    </ul>
+    <hr>
+</div>
+{{ end }}