doc: update diffusion models to include comfyui (#5079)

* doc: update diffusion models to include comfyui

* ci: auto fixes from pre-commit.ci

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---------

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docs/source/use-cases/diffusion-models/index.rst

@@ -1,5 +1,5 @@
 ================
-Diffusion Models
+Diffusion models
 ================
 
 This section provides example projects for image and video generation use cases.
@@ -21,10 +21,17 @@ This section provides example projects for image and video generation use cases.
 
         Deploy an image generation server for specific user requirements with BentoML using ControlNet.
 
+    .. grid-item-card:: :doc:`/use-cases/diffusion-models/comfyui`
+        :link: /use-cases/diffusion-models/comfyui
+        :link-type: doc
+
+        Deploy a ComfyUI workflow into a Bento API endpoint.
+
 .. toctree::
     :maxdepth: 1
     :titlesonly:
     :hidden:
 
     sdxl-turbo
     controlnet
+    comfyui