Update model_usage notebook

- Integrate notebook deps within notebook instead of separating them to
  a requirements.txt file
- Add dev deps for the notebook usage

Author: thodkatz

Diff for: dev/env.yaml

@@ -1,7 +1,6 @@
 name: core
 channels:
   - conda-forge
-  - defaults
 dependencies:
   - bioimageio.spec>=0.5.3
   - black
@@ -11,6 +10,8 @@ dependencies:
   - imageio>=2.5
   - jupyter
   - jupyter-black
+  - ipykernel
+  - matplotlib
   - keras>=3.0
   - loguru
   - numpy