Link to chatmail blog post

Author: link2xt

index.html

@@ -220,8 +220,8 @@ <h3 class="title">
 </tr>
 <tr>
   <td>chatmail</td>
-  <td><a href="https://github.com/deltachat/chatmail">chatmail setup</a></td>
-  <td></td>
+  <td><a href="https://delta.chat/en/2023-12-13-chatmail">chatmail blog post</a></td>
+  <td><a href="https://github.com/deltachat/chatmail">source code</a></td>
 </tr>
 <tr>
   <td>mail server</td>