🚀 feat: add Push functionality

[evolvewithevan]

🚀 feat: add Push functionality

Description
Implement support for pushing changes from GitCord to a connected GitHub repository. This should allow syncing local or user-triggered changes (e.g., templates, configs, etc.) to the remote repo.

Checklist

• Add !git push command or similar trigger
• Support both authenticated and token-based push
• Handle errors like detached HEAD, conflicts, or auth issues
• Add configuration to optionally auto-push after pull or merge
• Document the push functionality in the command list/help docs