docs: add One-Click Install heading to DXT card on website

Author: aborruso

website/src/pages/index.astro

@@ -335,7 +335,9 @@ const baseUrl = '/ckan-mcp-server';
           <!-- One-click install DXT -->
           <div class="bg-white border-2 border-gray-200 overflow-hidden">
             <div class="px-6 pt-5 pb-2">
-              <div class="mono text-xs font-medium tracking-widest uppercase text-data-blue mb-3">Claude Desktop · macOS &amp; Windows</div>
+              <div class="mono text-xs font-medium tracking-widest uppercase text-data-blue mb-2">Claude Desktop · macOS &amp; Windows</div>
+              <h3 class="display-font text-2xl font-semibold text-navy">One-Click Install</h3>
+              <p class="text-gray-500 text-sm mt-1">Download and double-click — no terminal, no config files.</p>
             </div>
             <div class="px-6 pb-6 flex flex-col sm:flex-row sm:items-start gap-5">
               <!-- Install dialog preview -->