Remove ipykernel from readthedocs

.readthedocs.yaml

@@ -6,11 +6,10 @@ build:
     python: "3.10"
   jobs:
     post_create_environment:
-      - pip install poetry==1.5.1
+      - pip install poetry==1.6.1
       - poetry config virtualenvs.create false
     post_install:
       - poetry install --without dev
-      - poetry run python -m ipykernel install --user
 
 sphinx:
   configuration: docs/conf.py