Delete no longer used CI/CD

.travis.yml

@@ -1,26 +0,0 @@
-language: python
-dist: focal # use LTS 20.04
-
-python:
-    - "3.6"
-    - "3.7"
-    - "3.8"
-
-env:
-    - DJANGO=2.2.23
-    - DJANGO=3.1.11
-    - DJANGO=3.2.3
-
-install:
-    - pip install -q Django==$DJANGO
-    - pip install -q -r requirements.txt
-    - pip install -q -r requirements-testing.txt
-
-before_script:
-    - "pycodestyle --exclude=migrations --ignore=E501,W503,W504 helpdesk"
-
-script:
-    - coverage run --source='.' quicktest.py helpdesk
-
-after_success:
-    - codecov