Update workflows

.github/workflows/mirroring.yml

@@ -1,19 +0,0 @@
-name: Mirroring
-
-on:
-  push:
-    branches:
-      - master
-  delete:
-    branches:
-      - master
-
-jobs:
-  mirroring:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v1
-      - uses: pixta-dev/repository-mirroring-action@v1
-        with:
-          target_repo_url: git@gitlab.com:hodgef/simple-keyboard.git
-          ssh_private_key: ${{ secrets.GL_KEY }}