Remove the deploy stage of the CI, which ended up never being used

.gitlab-ci.yml

@@ -8,7 +8,6 @@ workflow:
 
 stages:
   - test
-  - deploy
 
 # Move pip's and poetry's caches to somewhere gitlab can cache
 # https://pip.pypa.io/en/stable/topics/configuration/#environment-variables
@@ -35,11 +34,3 @@ test:
     - poetry run flake8 jubeatools
     - poetry run mypy jubeatools
     - poetry run pytest jubeatools --hypothesis-profile ci
-
-build and publish:
-  stage: deploy
-  when: manual
-  variables:
-    POETRY_PYPI_TOKEN_PYPI: $POETRY_PYPI_TOKEN_PYPI
-  script:
-    - poetry publish --build