Add joint inversion and PGI notebooks to TOC (#43)

Add missing notebooks to the TOC.

myst.yml

@@ -108,6 +108,13 @@ project:
       - file: notebooks/08-tdem/fwd_tdem_fundamentals.ipynb
       - file: notebooks/08-tdem/fwd_utem_3d.ipynb
       - file: notebooks/08-tdem/inv_tdem_1d.ipynb
+    - title: Joint Inversion
+      children:
+        - file: notebooks/11-joint-inversion/plot_inv_3_cross_gradient_pf.ipynb
+    - title: PGI Inversion
+      children:
+        - file: notebooks/12-pgi-inversion/plot_inv_1_joint_pf_pgi_full_info_tutorial.ipynb
+        - file: notebooks/12-pgi-inversion/plot_inv_2_joint_pf_pgi_no_info_tutorial.ipynb
 
 site:
   template: book-theme