Delete sync.yml

.github/workflows/sync.yml

@@ -1,20 +0,0 @@
-name: Sync to Gitlab
-
-on: 
-  push:
-  delete:
-  workflow_dispatch:
-
-jobs:
-  to_gitlab:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-      - uses: pixta-dev/repository-mirroring-action@v1
-        with:
-          target_repo_url:
-            git@gitlab.com:xrayr-project/XrayR-doc.git
-          ssh_private_key:
-            ${{ secrets.SSH_PRIVATEKEY }}