fix: add critical bug fixes and error handling

[daveylupes]

Fixed Broken Documentation Link

• Issue: Documentation link had [] prefix that made it unclickable/invalid
• Before: []https://github.com/Entropy-Foundation/supra-dev-hub
• After: https://github.com/Entropy-Foundation/supra-dev-hub

Added Directory Existence Check

• Issue: CLI would attempt to overwrite existing directories, causing errors
• Fix: Added check to prevent overwriting existing directories with clear error message

Removed Unused Import

• Issue: execSync was imported but never used
• Fix: Removed unused import for cleaner code

Project Name Validation

• Validates project names to ensure they only contain allowed characters (letters, numbers, hyphens, underscores)
• Prevents empty project names
• Provides clear error messages for invalid input

Comprehensive Error Handling

• Added try-catch blocks around file operations
• Graceful error handling for template directory reading
• Automatic cleaclean-up partially created directories on error
• Clear, user-friendly error messages

Template Directory Validation

• Checks if templates directory exists before reading
• Validates that templates are available
• Handles edge cases with appropriate error messages

[daveylupes]

Hi @supra-bharatjain, I’ve submitted this PR to improve the robustness and Developer Experience (DX) of the CLI tool.

I'm a big fan of what the team is building and wanted to help make the onboarding process as smooth as possible for new devs!