Reference newly released community forum.

Author: TasoOneAsia

xml/banner.xml

@@ -2,9 +2,8 @@
 
 <banner>
 
-Celebrating <link url="https://github.com/nginx/nginx/commit/0e8348c50">20 years</link>
-of nginx!
-Read about our journey and milestones in the
-<link url="https://blog.nginx.org/blog/celebrating-20-years-of-nginx">latest blog</link>.
+Join us on the new <link url="https://community.nginx.org">NGINX Community Forum</link>
+to connect with users, discover the latest community activity,
+and troubleshoot issues together.
 
 </banner>

xml/en/community.xml

@@ -82,7 +82,7 @@ Find the NGINX community here:
 </listitem>
 
 <listitem>
-<link url="https://community.nginx.org/joinslack">Slack</link>
+<link url="https://community.nginx.org">Community Forum</link>
 </listitem>
 
 <listitem>

xml/menu.xml

@@ -68,6 +68,7 @@
 <item href="/en/enterprise.html"> enterprise </item>
 <item />
 
+<item href="https://community.nginx.org"> community forum (new) </item>
 <item href="https://x.com/nginxorg"> x.com </item>
 <item href="https://blog.nginx.org/"> blog </item>
 <item />