Remove Greetings workflow

.github/workflows/greetings.yml

@@ -1,16 +0,0 @@
-name: Greetings
-
-on: [pull_request_target, issues]
-
-jobs:
-  greeting:
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
-    steps:
-    - uses: actions/first-interaction@v1
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-        issue-message: "Message that will be displayed on users' first issue"
-        pr-message: "Message that will be displayed on users' first pull request"