Add fern deep command to CLI reference documentation

Introduce a new 'fern deep' command that allows users to easily send an
email to Deep, one of Fern's co-founders. The command opens the user's
default email client with a mailto link pre-addressed to Deep.

This addition includes:
- Entry in the main commands table with description
- Detailed accordion section with usage information and examples
- Tips on when and how to use the command to connect with the Fern team

Author: fern-support

fern/products/cli-api-reference/pages/commands.mdx

@@ -14,6 +14,7 @@ hideOnThisPage: true
 | [`fern logout`](#fern-logout) | Log out of the Fern CLI |
 | [`fern export`](#fern-export) | Export an OpenAPI spec for your API |
 | [`fern api update`](#fern-api-update) | Manually update your OpenAPI spec |
+| [`fern deep`](#fern-deep) | Send an email to Deep, Fern co-founder |
 
 ## Documentation commands
 
@@ -579,12 +580,36 @@ hideOnThisPage: true
 
   ### api
 
-  Use `--api` to specify the API to update if there are multiple specs with a defined `origin` in `generators.yml`. If you don't specify an API, all OpenAPI specs with an `origin` will be updated. 
+  Use `--api` to specify the API to update if there are multiple specs with a defined `origin` in `generators.yml`. If you don't specify an API, all OpenAPI specs with an `origin` will be updated.
 
   <CodeBlock title="terminal">
     ```bash
     fern api update --api public-api
     ```
   </CodeBlock>
   </Accordion>
+
+  <Accordion title="fern deep">
+
+    Use `fern deep` to send an email directly to Deep, one of Fern's co-founders. This command opens a
+    mailto link in your default email client, making it easy to reach out with questions, feedback, or ideas.
+
+    <CodeBlock title="terminal">
+    ```bash
+    fern deep
+    ```
+    </CodeBlock>
+
+    When you run this command, your default email client will open with a new message addressed to Deep.
+    You can use this to:
+    - Share feedback about Fern
+    - Ask questions about features or best practices
+    - Report issues or suggest improvements
+    - Connect with the Fern team
+
+    <Tip>
+    Deep loves hearing from the community! Don't hesitate to reach out with your thoughts, questions, or just to say hi.
+    </Tip>
+
+  </Accordion>
 </AccordionGroup>