feat: feature the agentic-environment guide on the landing page; add a site favicon

agentic-setup/agentic-setup-overview.html

@@ -3,6 +3,7 @@
 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
+<link rel="icon" href="/favicon.svg" type="image/svg+xml">
 <title data-i18n data-en="Your Agentic Environment — A Field Guide" data-de="Deine agentische Umgebung — ein Feldführer">Your Agentic Environment — A Field Guide</title>
 <style>
 /* =========================================================================