NGF: Update ngf banner to use NGF dynamic version (#973)

Update NGF banner to use NGF dynamic version

Author: salonichf5

_banners/ngf-2.0-release.md

@@ -1,6 +1,8 @@
-{{< banner "notice" "NGINX Gateway Fabric 2.0 is now available" >}}
+{{< banner "notice" >}} 
 
-NGINX Gateway Fabric 2.0 has released! Follow [these instructions]({{< ref "/ngf/install/upgrade-version.md#upgrade-from-v1x-to-v2x" >}}) to upgrade from 1.x to 2.0.
+NGINX Gateway Fabric {{< version-ngf >}} is now available.
+
+NGINX Gateway Fabric {{< version-ngf >}} has released! Follow [these instructions]({{< ref "/ngf/install/upgrade-version.md#upgrade-from-v1x-to-v2x" >}}) to upgrade from 1.x to 2.0.
 
 For 1.x, checkout [an older version]({{< ref "/ngf/install/upgrade-version.md#access-nginx-gateway-fabric-1x-documentation" >}}) of documentation.