restore to code generated figure and reset to numref as should work

Author: mmcky

lectures/_config.yml

@@ -34,7 +34,6 @@ latex:
 sphinx:
   extra_extensions: [sphinx_multitoc_numbering, sphinxext.rediraffe, sphinx_tojupyter, sphinxcontrib.youtube, sphinx.ext.todo, sphinx_exercise, sphinx_togglebutton, sphinx.ext.intersphinx, sphinx_reredirects]
   config:
-    numfig: True
     bibtex_reference_style: author_year
     nb_mime_priority_overrides: [
        # HTML

lectures/cass_koopmans_1.md

@@ -22,10 +22,6 @@ kernelspec:
 
 # Cass-Koopmans Model
 
-```{contents} Contents
-:depth: 2
-```
-
 ## Overview
 
 This lecture and {doc}`Cass-Koopmans Competitive Equilibrium <cass_koopmans_2>` describe a model that Tjalling Koopmans {cite}`Koopmans`
@@ -1003,13 +999,14 @@ In addition to the three curves, Figure {numref}`stable_manifold` plots  arrows
   
   * If $C_0$ is set above the green line for a given $K_0$, too little capital is accumulated
 
-```{figure} _static/lecture_specific/cass_koopmans_1/fig_stable_manifold.png
-:name: stable_manifold
-```
-
-This figure is generated by the following code.
-
 ```{code-cell} ipython3
+---
+mystnb:
+  figure:
+    caption: "Stable Manifold and Phase Plane"
+    name: stable_manifold
+tags: [hide-input]
+---
 fig, ax = plt.subplots(figsize=(7, 5))
 
 K_range = np.arange(1e-1, 15, 0.1)
@@ -1058,9 +1055,6 @@ ax.set_ylabel('$C$')
 plt.show()
 ```
 
-   
-
-
 ## Concluding Remarks
 
 In {doc}`Cass-Koopmans Competitive Equilibrium <cass_koopmans_2>`,  we study a decentralized version of an economy with exactly the same