chore: update navigation to include 4 chat docs

Author: goosewin

fern/docs.yml

@@ -321,10 +321,20 @@ navigation:
                 icon: fa-light fa-arrow-right-arrow-left
 
       - section: Chat
+        icon: fa-light fa-comments
         contents:
-          - page: Chat
-            path: chat/chat.mdx
-            icon: fa-light fa-comments
+          - page: Quickstart
+            path: chat/quickstart.mdx
+            icon: fa-light fa-bolt-lightning
+          - page: Non-streaming
+            path: chat/non-streaming.mdx
+            icon: fa-light fa-message
+          - page: Streaming
+            path: chat/streaming.mdx
+            icon: fa-light fa-stream
+          - page: OpenAI compatibility
+            path: chat/openai-compatibility.mdx
+            icon: fa-brands fa-openai
 
       - section: Webhooks
         collapsed: true