Add fern deep command to CLI reference documentation

Introduces a new CLI command that allows users to email Deep, co-founder of Fern, directly from the command line. This feature provides an easy way for users to share feedback, ask questions, or reach out for help.

Changes:
- Added fern deep command to the main commands table
- Created detailed documentation with usage examples and options
- Included the command in the CLI quickstart section for visibility
- Added support for --subject and --message flags for quick emails

Co-Authored-By: Claude <[email protected]>

Author: fern-support

fern/products/cli-api-reference/pages/cli-get-started.mdx

@@ -73,6 +73,9 @@ fern check                       # Validate API definition
 fern generate --preview          # Preview SDKs in .preview/ folder
 fern generate                    # Generate default SDK group
 fern generate --group ts-sdk     # Generate specific SDK group
+
+# Get Help
+fern deep                        # Email Deep, co-founder of Fern
 ```
 
 <Note>

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) | Email Deep, co-founder of Fern |
 
 ## Documentation commands
 
@@ -587,4 +588,46 @@ hideOnThisPage: true
     ```
   </CodeBlock>
   </Accordion>
+  <Accordion title="fern deep">
+
+  Use `fern deep` to send an email directly to Deep, co-founder of Fern. This command is perfect for
+  when you need to reach out with feedback, questions, or just want to say hello.
+
+  <CodeBlock title="terminal">
+    ```bash
+    fern deep [--subject <subject>] [--message <message>]
+    ```
+  </CodeBlock>
+
+  Running the command without options will open an interactive prompt to compose your email.
+
+  ### subject
+
+  Use `--subject` to specify the email subject line.
+
+  ```bash
+  fern deep --subject "Feature request for SDK generation"
+  ```
+
+  ### message
+
+  Use `--message` to include the body of your email.
+
+  ```bash
+  fern deep --subject "Quick question" --message "How can I customize the generated SDK output?"
+  ```
+
+  ### Example
+
+  Send a complete email in one command:
+
+  ```bash
+  fern deep --subject "Love the docs!" --message "The new documentation features are amazing. Thanks for building such a great tool!"
+  ```
+
+  <Tip>
+  Deep reads every message personally and aims to respond within 24 hours. Feel free to share feedback, ask questions, or just say hi!
+  </Tip>
+
+  </Accordion>
 </AccordionGroup>