fix link

fixes #163

Author: 3nids

docs/docs/configuration/configuration.md

@@ -23,4 +23,4 @@ parameters:
 
 ## Complete documentation
 
-For detailed configuration options, see the [Configuration Model](config_model.md).
+For detailed configuration options, see the [Configuration Model](models/config_model).

docs/docs/configuration/demo_data.md

@@ -8,7 +8,7 @@ Demo data is defined in your [configuration file](configuration.md) using the `d
 
 ## Configuration
 
-Demo data is configured using the [`DemoDataModel`](../api/config_model.md#demodatamodel) in your `.pum.yaml` configuration file. Each demo dataset requires:
+Demo data is configured using the [`DemoDataModel`](models/demo_data_model) in your `.pum.yaml` configuration file. Each demo dataset requires:
 
 - **name**: A descriptive name for the demo dataset
 - **file**: Path to a single SQL file containing the demo data