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.

.dockerignore

@@ -3,3 +3,5 @@
 .docker-compose*
 Dockerfile
 *.md
+.env*
+data/