Removed greetings workflow (not working on forks)

.github/workflows/greetings.yml

@@ -1,11 +0,0 @@
-name: Greetings
-on: [pull_request, issues]
-jobs:
-  greeting:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/first-interaction@v1
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          issue-message: 'Thanks for creating your first issue :+1: Feel free to use [Slack](https://join.slack.com/t/qdm12/shared_invite/enQtODMwMDQyMTAxMjY1LTU1YjE1MTVhNTBmNTViNzJiZmQwZWRmMDhhZjEyNjVhZGM4YmIxOTMxOTYzN2U0N2U2YjQ2MDk3YmYxN2NiNTc) if you just need some quick help or want to chat'
-          pr-message: 'Thank you so much for contributing, that means a lot to me :wink:'