Add the simple diffusion model tutorial

docs/conf.py

@@ -38,6 +38,7 @@
     'getting_started_with_jax_for_AI.md',
     'JAX_for_PyTorch_users.md',
     'JAX_porting_PyTorch_model.md',
+    'digits_diffusion_model.md',
     'JAX_for_LLM_pretraining.md',
 ]
 
@@ -64,5 +65,6 @@
 nb_execution_excludepatterns = [
     'JAX_for_PyTorch_users.ipynb',
     'JAX_porting_PyTorch_model.ipynb',
+    'digits_diffusion_model.ipynb',
     'JAX_for_LLM_pretraining.ipynb',
 ]