style: add axis margins to causal graph to prevent large nodes from clipping

Author: TasfinMahmud

deliverables/paper_causal_graph.png

@@ -91,6 +91,8 @@
     font_weight='bold',
     arrowsize=20,
 )
+ax = plt.gca()
+ax.margins(0.20)
 plt.title('Visual Causal Graph (Pearl Rung-2 SCM)')
 plt.savefig('paper_causal_graph.png', dpi=300, bbox_inches='tight')
 plt.close()