Refactor X bot to use dedicated x_config.yaml configuration
- Split X bot configuration from main config.yaml into x_config.yaml
- Updated all config loading functions to use new configuration structure
- Added x_config.yaml to .gitignore for security
- Updated documentation with new configuration format and structure
- Improved error handling and validation for configuration loading
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Co-Authored-By: Claude <noreply@anthropic.com>