Fix HTML entity in AI/LLM heading per code review

Co-authored-by: garrytrinder <11563347+garrytrinder@users.noreply.github.com>

Author: Copilot

src/pages/index.astro

@@ -127,7 +127,7 @@ import Layout from '../layouts/Layout.astro';
       <div class="section-reveal grid md:grid-cols-2 gap-12 md:gap-16 items-center">
         <div>
           <p class="text-sm font-semibold tracking-widest uppercase text-purple-400 mb-4">AI / LLM Testing</p>
-          <h3 class="text-3xl md:text-4xl font-bold mb-6 leading-tight">Build &amp; test AI apps without burning tokens.</h3>
+          <h3 class="text-3xl md:text-4xl font-bold mb-6 leading-tight">Build & test AI apps without burning tokens.</h3>
           <p class="text-lg leading-relaxed mb-6" style="color: var(--text-muted);">
             Simulate responses from OpenAI, Azure OpenAI, and other language model APIs. Test error handling, content filtering, and rate limits without real API costs.
           </p>