removing output templates notebook from highlighted code samples for developers (#539)

Author: johnwalz97

site/developer/get-started-validmind-library.qmd

@@ -33,7 +33,7 @@ listing:
     sort: false
     fields: [title, description]
     contents: 
-    - ../notebooks/code_samples/customization/customizing_tests_with_output_templates.ipynb
+    - ../notebooks/code_samples/custom_tests/integrate_external_test_providers.ipynb
     - ../notebooks/code_samples/nlp_and_llm/prompt_validation_demo.ipynb
     - ../notebooks/code_samples/time_series/quickstart_time_series_full_suite.ipynb
   - id: developer-workflow