Update README.md to enhance structure and clarity by adding headings and improving formatting for environment variables and project components

README.md

@@ -14,22 +14,25 @@ A containerized SSH backup server built on Alpine Linux, designed to provide sec
 
 ```bash
 docker run -p 20022:20022 -v /backup/data:/home/backup safebox/backup-client
+```
 
-Configuration
-Environment Variables
-Variable	Default	Description
-SSH_PORT	20022	SSH server listening port
-SSH_USER	backup	Backup user name
-SSH_PASSWORD	backup	User password for authentication
+## Configuration
+### Environment Variables
 
-How it Works
+| Variable     | Default | Description                   |
+|--------------|---------|-------------------------------|
+| SSH_PORT     | 20022   | SSH server listening port     |
+| SSH_USER     | backup  | Backup user name              |
+| SSH_PASSWORD | backup  | User password for authentication |
+
+## How it Works
 The container automatically:
 
 User Setup: Creates the backup user with configured credentials
-SSH Configuration: Generates host keys (RSA and Ed25519) if not present
-Server Start: Launches SSH daemon with SFTP support
+SSH Configuration: Generates host keys (Ed25519) if not present
+Server Start: Launches SSH daemon
 
-Key Components
+## Key Components
 Dockerfile: Alpine-based image with OpenSSH, su-exec, and BorgBackup
 start_backup.sh: Main entrypoint script handling SSH setup 
 .drone.yml: CI/CD pipeline for multi-architecture builds
@@ -39,16 +42,12 @@ Host Key Persistence: SSH host keys are generated once and persisted
 Configurable Authentication: Supports both password and public key authentication
 User Isolation: Runs SSH daemon as non-root user
 
-Development
-Building Locally
-Testing
-CI/CD
-The project uses Drone CI for automated builds:
+## Development
 
 Development builds: Push to registry.dev.format.hu/backup-client
 Release builds: Tag events push to safebox/backup-client on DockerHub
 Multi-architecture: Supports both AMD64 and ARM64 platforms
 
-License
+## License
 This project is open source. Please check the license file for details.