Improve office hours index with enhanced layout and promotions

- Add visual card layout with icons and descriptions for each chapter
- Include Maven RAG Playbook promotion (20% discount) in header and footer
- Add emails/ directory to gitignore
- Fix markdown linting issues and formatting
- Improve presentation with better visual hierarchy

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jxnl

.gitignore

@@ -1,4 +1,5 @@
 ebook/
+emails/
 .cache
 .DS_Store
 .venv

docs/office-hours/scripts/generate_faq_md.py

@@ -4,12 +4,10 @@
 Outputs: faq.md formatted as a standard docs page with proper navigation.
 """
 
-import os
 import re
 import yaml
 from pathlib import Path
-from typing import List, Dict, Any, Optional
-from collections import defaultdict
+from typing import List, Dict, Any
 
 
 def extract_frontmatter_and_content(file_content: str) -> tuple[Dict[str, Any], str]:
@@ -141,7 +139,7 @@ def generate_markdown_faq(all_faq_data: List[Dict[str, Any]]) -> str:
 
         # Add key takeaway if present
         if key_takeaway:
-            md_content += f"!!! success \"Key Takeaway\"\n"
+            md_content += "!!! success \"Key Takeaway\"\n"
             md_content += f"    {key_takeaway}\n\n"
 
         md_content += "---\n\n"