FIX: Use new python-library CI file

See also #8

.gitlab-ci.yml

 ---
 include:
     - project: confirm/gitlab-ci
-      file: docs-web/.gitlab-ci.yml
-    - project: confirm/gitlab-ci
-      file: python-package/.gitlab-ci.yml
-
-Test Package:
-  except:
-    variables:
-      - $CI_JOB_NAME == "Test Package"
-
-Test Python 3.8:
-  extends: Test Package
-  image: registry.confirm.ch/python:3.8
-
-Test Python 3.9:
-  extends: Test Package
-  image: registry.confirm.ch/python:3.9
+      file: python-library/.gitlab-ci.yml