Remove unused workflow

.github/workflows/ci.yaml

@@ -1,32 +0,0 @@
-name: Django CI
-
-on:
-  push:
-    branches: [ $default-branch ]
-  pull_request:
-    branches: [ $default-branch ]
-
-jobs:
-
-  # Run tests on an SQLite database
-  sqlite:
-
-    runs-on: ubuntu-latest
-
-    strategy:
-      max-parallel: 4
-      matrix:
-        python-version: [3.7, 3.8, 3.9]
-
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Install dependencies
-        run: |
-          pip3 install invoke
-          invoke install
-      - name: Run Tests
-        run: invoke coverage