Add docs on providing overrides JSON files

Author: agriyakhetarpal

docs/configuration.md

@@ -44,13 +44,19 @@ dependencies:
   - ipycanvas
 ```
 
-## JupyterLite config
+## JupyterLite configuration
 
-You can provide [custom configuration](https://jupyterlite.readthedocs.io/en/latest/howto/index.html#configuring-a-jupyterlite-deployment)
-to your JupyterLite deployment.
+You can provide [custom configuration files](https://jupyterlite.readthedocs.io/en/latest/howto/configure/config_files.html)
+to your JupyterLite deployment for build-time configuration and settings overrides.
+
+<!-- TODO: Run-time configuration via `jupyter-lite.json` not added yet here
+because I can't yet find a direct jupyter lite CLI mapping for that option -->
 
 ```python
-jupyterlite_config = "jupyterlite_config.json"
+# Build-time configuration for JupyterLite
+jupyterlite_config = "jupyter_lite_config.json"
+# Override plugins and extension settings
+jupyterlite_overrides = "overrides.json"
 ```
 
 ## Strip particular tagged cells from IPython Notebooks