Add reference to configuration file
Adds reference to configuration file term for first appearance in the tutorials.
@@ -37,7 +37,7 @@ Setup
Run the workflow
----------------
-From within the ``ncov/`` directory, run the workflow using a configuration file provided in the tutorial directory:
+From within the ``ncov/`` directory, run the workflow using a :term:`configuration file <config file>` provided in the tutorial directory:
.. code:: text
