[DOCS] Adds EOL announcement to landing page.

Author: szabosteve

docs/index-custom-title-page.html

@@ -61,6 +61,9 @@ <h2>Documentation</h2>
       </p>
       <p>
         The Perl client provides strongly typed requests and responses for all Elasticsearch APIs.
+        The end-of-life for version 8 of the elastic/elaticsearch-perl software has been announced. 
+        The announcement marks the final milestone of the lifecycle management phase of the 8.x 
+        release family. 8.x is the last major version supported by Elastic.
       </p>
       <p>
         <a href="https://www.elastic.co/guide/en/elasticsearch/client/perl-api/current/_features.html">