feat(code): Add quick data querying notebook

Added a notebook which has the sole point of quickly allowing me
to grab and look at the data of the processed sample I am creating.

I.e. quickly list and uniq all interventions/outcomes/inequalities,
doing a tiny calculation or similar.

00-notebooks/yml-grab.qmd

@@ -0,0 +1,23 @@
+---
+bibliography: 02-data/supplementary/lib.bib
+title: Grab yml
+---
+
+```{python}
+import pandas as pd
+from src import data
+
+df = data.from_yml()
+```
+
+Get interventions:
+
+```{python}
+df['intervention'].str.split(";").explode().str.strip().value_counts()
+```
+
+Get inequalities:
+
+```{python}
+df['inequality'].str.split(";").explode().str.strip().value_counts()
+```