Add missing module level docstrings.

src/primaite/config/__init__.py

@@ -0,0 +1 @@
+"""Configuration parameters for running experiments."""

src/primaite/data_viz/__init__.py

@@ -1,5 +1,5 @@
-from enum import Enum
 """Utility to generate plots of sessions metrics after PrimAITE."""
+from enum import Enum
 
 class PlotlyTemplate(Enum):
     """The built-in plotly templates."""