[ arbadacarbaYK/gittr ] Add comprehensive SSH port 22 troubleshooting guide
- Created SSH_PORT_22_TROUBLESHOOTING.md with step-by-step fixes
- Covers Hetzner Cloud Firewall (most common issue)
- Covers server local firewall (ufw/iptables)
- Covers SSH service and configuration issues
- Updated all relevant docs to reference the troubleshooting guide
- Added explicit Hetzner Cloud Firewall instructions to deployment guide