Simplify installation steps and replace CLI mockup with screenshot

[singerbj]

Summary

This PR streamlines the getting started experience by reducing installation complexity and replacing the hand-crafted CLI interface mockup with an actual screenshot of the application.

Key Changes

• Simplified Installation Flow: Reduced from 3 steps to 2 by removing the global npm installation requirement

  • Users can now run npx ember-mug@latest directly without pre-installation
  • Updated Installation component to reflect the new 2-step process

• Replaced CLI Mockup with Screenshot:

  • Removed ~130 lines of React component code that rendered a styled ASCII art CLI interface
  • Replaced with actual screenshot image (/screenshot.png) for more authentic representation
  • Removed all associated CSS styling for the CLI panels, temperature display, battery indicator, presets, etc.

• Updated Documentation:

  • README.md now recommends npx ember-mug@latest instead of global installation
  • Installation guide text updated from "Three simple steps" to "Two simple steps"

Implementation Details

• The Terminal component now simply displays an image instead of rendering complex nested components
• Removed 270+ lines of CSS related to CLI styling (panels, sliders, ASCII art, animations)
• Cleaner, more maintainable codebase with less custom styling to maintain
• Better user experience by showing actual product UI rather than a stylized mockup

https://claude.ai/code/session_01DQmbu6QUR8JUc8JkPpG1S5