Add 3.6.0 announcement.

While at it, fixing the s/July/Jul/ in the previous entry.

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

Author: igsilya

_includes/side-widgets.html

@@ -5,7 +5,10 @@
   <div class="widget-body">
     <ul>
       <li>
-        <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2025-July/000372.html>July 31 2025: OVS+OVN '25: Call for Participation</a>
+        <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2025-August/000373.html>Aug 18 2025: Open vSwitch 3.6.0 is now Available!</a>
+      </li>
+      <li>
+        <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2025-July/000372.html>Jul 31 2025: OVS+OVN '25: Call for Participation</a>
       </li>
       <li>
         <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2025-June/000368.html>Jun 02 2025: Open vSwitch 3.5.1, 3.4.3 and 3.3.5 are available</a>
@@ -76,9 +79,6 @@
       <li>
         <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2022-December/000308.html>Dec 01 2022: Open vSwitch 3.0.2 and 2.17.4 are available</a>
       </li>
-      <li>
-        <a href=https://mail.openvswitch.org/pipermail/ovs-announce/2022-October/000300.html>Oct 07 2022: Open vSwitch 3.0.1, 2.17.3, 2.16.5, 2.15.6, 2.14.7 and 2.13.9 are available</a>
-      </li>
     </ul>
   </div>
 </div>