docs: add GPT-Live section navigation and beta badge

Author: dvsth

fern/docs.yml

@@ -91,6 +91,7 @@ layout:
   page-width: full
   content-width: 55rem
   sidebar-width: 300px
+  show-nav-availability-badges: true
 analytics:
   posthog:
     api-key: ${POSTHOG_PROJECT_API_KEY}
@@ -317,16 +318,22 @@ navigation:
                 path: tools/custom-tools-troubleshooting.mdx
                 icon: fa-light fa-wrench
           - section: GPT-Live
+            icon: fa-light fa-microphone-lines
+            availability: beta
             collapsed: true
             contents:
               - page: Overview
                 path: gpt-live/overview.mdx
+                availability: stable
               - page: Design your assistant
                 path: gpt-live/design.mdx
+                availability: stable
               - page: Configuration
                 path: gpt-live/configuration.mdx
+                availability: stable
               - page: Limitations and FAQs
                 path: gpt-live/limitations.mdx
+                availability: stable
           - page: Custom keywords
             path: customization/custom-keywords.mdx
             icon: fa-light fa-bullseye

fern/gpt-live/overview.mdx

@@ -10,9 +10,25 @@ GPT-Live is an OpenAI voice model that can listen and speak at the same time. A
 Vapi connects that conversation to your tools and phone numbers, and provides the call records, analysis, and monitoring around it.
 
 <Note>
-GPT-Live must be enabled for your Vapi organization. If you don't have access yet, [join the waitlist](https://vapi.ai/gpt-live-waitlist). We're admitting users from the waitlist every day.
+**Private beta.** GPT-Live must be enabled for your Vapi organization. If you don't have access yet, [join the waitlist](https://vapi.ai/gpt-live-waitlist). We're admitting users from the waitlist every day.
 </Note>
 
+## In this guide
+
+Start here for an overview, then choose what you need next.
+
+<CardGroup cols={3}>
+  <Card title="Design your assistant" icon="fa-light fa-comments" href="/gpt-live/design">
+    Plan speaker and reasoner roles, conversation flow, and speaking style.
+  </Card>
+  <Card title="Configuration" icon="fa-light fa-sliders" href="/gpt-live/configuration">
+    Create an assistant, choose a voice, connect tools, and make a call.
+  </Card>
+  <Card title="Limitations and FAQs" icon="fa-light fa-circle-question" href="/gpt-live/limitations">
+    Check supported features and what to consider before migrating.
+  </Card>
+</CardGroup>
+
 ## How it works
 
 A GPT-Live assistant uses a **speaker** for the spoken interaction and a **reasoner** for tasks that need tools or detailed procedures. **Delegation** is the speaker asking the reasoner to handle one of those tasks.
@@ -50,10 +66,4 @@ You also have more to design than the words alone. Set a voice, give the speaker
 
 GPT-Live has a different set of supported features from Vapi's other voice architectures. Check [Limitations and FAQs](/gpt-live/limitations) if your application depends on squads, live call control, simulations, or a specific transfer flow.
 
-## Get started
-
-- **Explore the experience:** read [Design your assistant](/gpt-live/design) for architecture, conversation flow, and voice design.
-- **Build a working assistant:** follow [Configure GPT-Live](/gpt-live/configuration#create-an-assistant) in the dashboard or API.
-- **Assess a migration:** review [Limitations and FAQs](/gpt-live/limitations) against your current requirements.
-
 For the underlying model, see OpenAI's [GPT-Live documentation](https://developers.openai.com/api/docs/guides/live). This section describes Vapi's integration and its supported configuration.