drop nginx lint GitHub Actions workflow

.github/workflows/nginx.yml

@@ -1,16 +0,0 @@
-name: Lint nginx configuration
-
-on: [pull_request, push]
-
-jobs:
-  static:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-
-    - run: sudo apt-get update
-    - run: sudo apt-get -y install python3-pip python3-setuptools
-    - run: pip3 install wheel
-    - run: pip3 install gixy
-    - run: ~/.local/bin/gixy nginx/nginx.conf