Refactor application structure and enhance logging

- Introduced a Configuration struct to manage application settings.
- Created a State struct to encapsulate application state and dependencies.
- Replaced log package with logrus for improved logging capabilities.
- Implemented graceful shutdown handling for the HTTP server.
- Added context management for background tasks.
- Updated database initialization to ensure tables are created.
- Refactored user management functions to use the new State struct.
- Enhanced error handling and logging throughout the application.
- Updated README to reflect changes in user addition process.

docker-compose.dev.yaml

@@ -9,7 +9,7 @@ services:
       - data:/app/data
     environment:
       - NICK=${NICK}
-      - PASSWORD=${PASS}
+      - PASS=${PASS}
 
 volumes:
   data: