DOC-5877 added home page AI-friendly metadata

Author: andy-stark-redis

layouts/home.html

@@ -1,6 +1,12 @@
 {{ define "head" }}
 
 <script src='{{ relURL "js/cli.js" }}' defer></script>
+
+<!-- AI-friendliness meta tags -->
+<meta name="ai-documentation" content="https://redis.io/llms.txt">
+<meta name="ai-formats" content="markdown">
+<link rel="ai-documentation" href="https://redis.io/llms.txt" type="text/plain">
+
 {{ end }}
 
 {{ define "main" }}