- Changed git pull execution from POST-only to always run on page load
- Replaced sudo with su for better user switching in command execution
- Removed form submission in favor of direct execution with retry button
- Simplified UI by always showing result message and conditionally showing retry button
- Add new `gitpull.php` page for manual git pull execution by administrators
- Remove automatic git pull on homepage visit to prevent unintended updates
- Include git pull link in admin navigation menu for easy access
- Secure interface with admin-only access and sudo credentials configuration
