docs: separate configuration and logging documentation

Extracts logging documentation into its own file (docs/logging.md) and updates README.md to link to both configuration and logging guides.

README.md

@@ -41,11 +41,10 @@ make test
 make lint
 ```
 
-## Configuration
+## Documentation
 
-The application is configured via a YAML file (default `config/config.yaml`) and environment variables.
+- [Configuration Guide](docs/configuration.md): Details on YAML config, environment variables, and CLI flags.
-
+- [Logging Guide](docs/logging.md): Information about log levels and structured logging format.
-For detailed documentation on configuration options and logging, see [docs/configuration.md](docs/configuration.md).
 
 ## Docker
 

docs/configuration.md

@@ -1,8 +1,8 @@
-# Configuration and Logging
+# Configuration
 
-This application uses a flexible configuration system that supports YAML files and environment variable overrides. It also features a structured logging setup.
+This application uses a flexible configuration system that supports YAML files and environment variable overrides.
 
-## Configuration
+## Configuration File
 
 The configuration is loaded from a YAML file. By default, the application looks for `config/config.yaml`. You can specify a different configuration file using the `-config` CLI flag.
 
@@ -10,7 +10,7 @@ The configuration is loaded from a YAML file. By default, the application looks
 ./app -config /path/to/my-config.yaml
 ```
 
-### Configuration Structure
+### Structure
 
 The configuration file supports the following structure:
 
@@ -26,7 +26,7 @@ server:
   port: 8080
 ```
 
-### Environment Variables
+## Environment Variables
 
 All configuration values can be overridden using environment variables. The application uses the `APP_` prefix for all environment variables. The variable name is constructed by capitalizing the path to the configuration value and replacing dots/nesting with underscores.
 
@@ -43,28 +43,3 @@ To start the application with `debug` logging and listening on port `9090`:
 ```bash
 APP_LOGGING_LEVEL=debug APP_SERVER_PORT=9090 ./app
 ```
-
-## Logging
-
-The application uses structured logging (JSON format) via the standard library's `log/slog` package.
-
-### Log Levels
-
-The supported log levels are:
-
-*   `debug`: Detailed information for debugging purposes.
-*   `info`: General operational events (startup, shutdown, etc.).
-*   `warn`: Non-critical errors or potential issues.
-*   `error`: Critical errors that require attention.
-
-The log level is configured via the `logging.level` setting in the configuration file or the `APP_LOGGING_LEVEL` environment variable.
-
-### Log Output
-
-Logs are output to `stdout` in JSON format to facilitate parsing by log management systems.
-
-**Example Log Entry:**
-
-```json
-{"time":"2023-10-27T10:00:00.123Z","level":"INFO","msg":"Starting application..."}
-```

docs/logging.md

@@ -0,0 +1,24 @@
+# Logging
+
+The application uses structured logging (JSON format) via the standard library's `log/slog` package.
+
+## Log Levels
+
+The supported log levels are:
+
+*   `debug`: Detailed information for debugging purposes.
+*   `info`: General operational events (startup, shutdown, etc.).
+*   `warn`: Non-critical errors or potential issues.
+*   `error`: Critical errors that require attention.
+
+The log level is configured via the `logging.level` setting in the configuration file or the `APP_LOGGING_LEVEL` environment variable.
+
+## Log Output
+
+Logs are output to `stdout` in JSON format to facilitate parsing by log management systems.
+
+**Example Log Entry:**
+
+```json
+{"time":"2023-10-27T10:00:00.123Z","level":"INFO","msg":"Starting application..."}
+```