Add audio routing note to Getting Started guide

Link to the Audio Routing guide from the Window Capture section
since OBS window capture doesn't include audio.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: steveseguin

docs/getting-started.html

@@ -145,10 +145,13 @@ <h2>Window Capture with OBS</h2>
         <p><strong>Pro Tip:</strong> Use <code>--title="My Stream"</code> to set a custom window title, making it easier to identify in OBS.</p>
       </div>
 
+      <p><strong>Need audio?</strong> Window Capture in OBS captures video only. To route audio from Electron Capture to OBS, you'll need a virtual audio cable. See our <a href="audio-setup.html">Audio Routing Guide</a> for step-by-step instructions using VB-Cable or VoiceMeeter.</p>
+
       <h2>Next Steps</h2>
       <ul>
         <li><a href="command-line.html">Command Line Usage</a> - Automate with CLI parameters</li>
         <li><a href="screen-sharing.html">Screen Sharing</a> - Auto-select screens without prompts</li>
+        <li><a href="audio-setup.html">Audio Routing</a> - Capture audio with VB-Cable</li>
         <li><a href="vdo-ninja.html">VDO.Ninja Integration</a> - Optimize for VDO.Ninja</li>
       </ul>
     </div>