Fix Lambda Cloud tutorial print statements and improve formatting

**Sections Fixed:**
- ✅ Option 1 (Web Console Setup): Converted from code with print to markdown
- ✅ Option 2 (API Setup): Split into markdown guide + clean code example
- ✅ Instance Management and Cleanup: Converted from code with print to markdown

**Improvements:**
- Moved setup instructions from print statements to proper markdown formatting
- Created dedicated markdown cell for CLI setup guide with code examples
- Converted instance management guide to markdown with proper code blocks
- Added automated cleanup script as markdown code block
- Separated Clustrix integration code into dedicated code cell
- Fixed missing execution_count fields for notebook validation

**Professional Standards:**
- Consistent markdown formatting across all sections
- Better readability and user experience
- Proper separation of instructional content (markdown) from executable code
- Enhanced documentation presentation

This completes the print statement cleanup for all Lambda Cloud tutorial sections.

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

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

Author: jeremymanning