docs: introduce Mercury Notebook Deliverable Pattern

template/MercuryNotebook/tests/conftest.py

@@ -0,0 +1,7 @@
+"""Make studylib importable without installation (the template is not
+pip-installed; real studies use ``pip install -e ".[dev]"`` instead)."""
+
+import pathlib
+import sys
+
+sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent.parent))