docs: Fix Claude Code install instructions to use marketplace plugin

The installation docs were incorrectly showing MCP server setup instead
of the marketplace plugin installation method.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dcramer

docs/src/pages/index.astro

@@ -24,16 +24,12 @@ const base = import.meta.env.BASE_URL.replace(/\/$/, '');
 
   <section class="section">
     <h2>Quick Start</h2>
-    <p>Install the dex skill for Claude Code:</p>
+    <p>Install the dex plugin from the Claude Code marketplace:</p>
     <Terminal title="Terminal">
-      <pre class="cli-output"><span class="cli-dim">$</span> claude mcp add dex -- npx -y @zeeg/dex
-<span class="cli-green">Added</span> MCP server dex</pre>
+      <pre class="cli-output"><span class="cli-dim">$</span> claude plugin marketplace add dcramer/dex
+<span class="cli-dim">$</span> claude plugin install dex@dex</pre>
     </Terminal>
-    <p>Or with <a href="https://github.com/anthropics/skills">skills</a>:</p>
-    <Terminal title="Terminal">
-      <pre class="cli-output"><span class="cli-dim">$</span> npx skills add dcramer/dex</pre>
-    </Terminal>
-    <p>Restart Claude Code, then use <code>/dex</code> to manage tasks.</p>
+    <p>Then use <code>/dex</code> to manage tasks.</p>
   </section>
 
   <section class="section scenarios">

docs/src/pages/install.astro

@@ -7,11 +7,12 @@ import Terminal from '../components/Terminal.astro';
   <h1>Installation</h1>
 
   <h2>Claude Code</h2>
-  <p>Add dex as an MCP server to Claude Code:</p>
+  <p>Install the dex plugin from the Claude Code marketplace:</p>
   <Terminal title="Terminal">
-    <pre class="cli-output"><span class="cli-dim">$</span> claude mcp add dex -- npx -y @zeeg/dex</pre>
+    <pre class="cli-output"><span class="cli-dim">$</span> claude plugin marketplace add dcramer/dex
+<span class="cli-dim">$</span> claude plugin install dex@dex</pre>
   </Terminal>
-  <p>Restart Claude Code after installation. The <code>/dex</code> skill will be available.</p>
+  <p>The <code>/dex</code> skill will be available immediately.</p>
 
   <h2>Skills CLI</h2>
   <p>If you use the <a href="https://github.com/anthropics/skills">skills CLI</a>:</p>