Fix broken documentation link.

docs/creating/config.md

@@ -42,7 +42,7 @@ To test your model pipeline, `config.init.time_subset` is a good way to limit yo
     See our [time adjustment page](../advanced/time.md) for more details.
 
 !!! info "See also"
-    The full set of available configuration options is documented in the [configuration schema](../reference/config_schema.md).
+    The full set of available configuration options is documented in the [configuration schema][model-configuration-schema].
     This provides you with a description of each configuration option and the default which will be used if you do not provide a value.
 
 ## Deep-dive into some key configuration options

mkdocs.yml

@@ -156,7 +156,7 @@ nav:
       - reference/api/attrdict.md
       - reference/api/exceptions.md
       - reference/api/logging.md
-    - Model configuration schema: reference/config_schema.md
+    - reference/config_schema.md
     - reference/data_table_schema.md
     - reference/model_schema.md
     - reference/math_schema.md

src/calliope/config.py

@@ -268,6 +268,14 @@ class Solve(ConfigBaseModel):
 class CalliopeConfig(ConfigBaseModel):
     """Calliope configuration class."""
 
+    model_config = {
+        "title": "Model configuration schema",
+        "extra": "forbid",
+        "frozen": True,
+        "revalidate_instances": "always",
+        "use_attribute_docstrings": True,
+    }
+
     init: Init = Init()
     build: Build = Build()
     solve: Solve = Solve()