Replace Cartesia references with OpenRouter

- Updated project-structure.mdx to reference OpenRouter's API documentation instead of Cartesia's Fern configuration
- Updated http-snippets.mdx to reference OpenRouter's API documentation as an example
- Updated websockets.mdx to use generic caption instead of Cartesia-specific reference

Co-Authored-By: Kapil Gowru <[email protected]>

Author: devin-ai-integration[bot]

fern/products/api-def/ferndef-pages/websockets.mdx

@@ -81,7 +81,7 @@ A `channel` is defined by the following fields:
 
 Fern renders a unique reference page for WebSockets. The **Handshake** section outlines the protocol for connecting with the server, while the **Send** and **Receive** sections outline the message schemas that can be sent between the client and server. 
 
-<Frame caption="Cartesia's WebSocket Reference page">
+<Frame caption="WebSocket Reference page example">
 <img src="./wss-reference.png" alt="The WebSocket Reference" />
 </Frame>
 
@@ -93,4 +93,4 @@ Users can connect to and use WebSockets from right within the API Reference (che
 
 <Frame caption="Click 'Play' to open the WebSocket Playground">
 <img src="./websocket.png" alt="WebSocket Playground"/>
-</Frame>
+</Frame>

fern/products/docs/pages/api-references/http-snippets.mdx

@@ -81,4 +81,4 @@ HTTP snippets automatically include:
 - If no SDK snippets exist, HTTP snippets will display automatically
 - User language preferences are saved client-side
 
-To see HTTP snippets in action, check out [Cartesia's API documentation](https://docs.cartesia.ai/api-reference/tts/bytes) for a live example of how they appear in production documentation.
+To see HTTP snippets in action, check out [OpenRouter's API documentation](https://openrouter.ai/docs/quickstart) for a live example of how they appear in production documentation.

fern/products/docs/pages/getting-started/project-structure.mdx

@@ -141,7 +141,7 @@ title: Fern's Documentation
     ```
     </CodeBlock>
 
-    To see this in practice, check out [Cartesia's Fern configuration](https://github.com/cartesia-ai/docs/tree/main/fern/apis/version-2025-04-16/definition).
+    To see this in practice, check out [OpenRouter's API documentation](https://openrouter.ai/docs/quickstart).
 
   </Accordion>
   <Accordion title="Multiple APIs">
@@ -180,6 +180,6 @@ title: Fern's Documentation
 
 ## `fern.config.json`
 
-<Markdown src="/snippets/fern-config-json-reference.mdx" />   
+<Markdown src="/snippets/fern-config-json-reference.mdx" />