Remove .github/

After moving the repository from github, we no longer need the
.github/ folder

Change-Id: I217caebc1b59a7394cdc54110afd75138f490238

.github/workflows/unit_tests.yml

@@ -1,23 +0,0 @@
-name: unit_tests
-
-on:
-  pull_request:
-
-jobs:
-  test:
-    runs-on: ubuntu-22.04
-    timeout-minutes: 30
-    strategy:
-      matrix:
-        env:
-          - pep8
-          - py39
-          - py311
-    steps:
-      - uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-      - name: Install dependencies
-        run: ./tools/install_deps.sh
-      - name: Run tox
-        run: tox -e ${{ matrix.env }}