Add Docker support and enhance configuration management

- Introduced Dockerfile for building and running the application in a containerized environment.
- Added .dockerignore to exclude unnecessary files from the Docker context.
- Updated README.md with detailed Docker installation instructions and Node.js version management using nvm.
- Refactored environment variable handling in src/index.ts and src/config/hass.config.ts for improved configuration management.
- Enhanced TypeScript configuration to include JSON module resolution and updated exclusion patterns.
- Updated .gitignore to include additional files for better environment management.

.dockerignore

@@ -0,0 +1,30 @@
+# Dependencies
+node_modules
+npm-debug.log
+
+# Build outputs
+dist
+
+# Environment and config
+.env
+.env.*
+
+# Version control
+.git
+.gitignore
+
+# IDE
+.vscode
+.idea
+
+# Testing
+coverage
+__tests__
+
+# Logs
+*.log
+
+# Documentation
+README.md
+LICENSE
+CHANGELOG.md