Remove GitHub Actions that move issues to project

.github/workflows/backlog.yaml

@@ -1,18 +0,0 @@
-# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
-name: Add issues/PRs to backlog automatically
-
-on:
-  issues:
-    types:
-      - opened
-      - transferred
-
-jobs:
-  add-to-project:
-    name: Add issue to backlog
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/add-to-project@main
-        with:
-          project-url: https://github.com/orgs/spectreconsole/projects/1
-          github-token: ${{ secrets.PROJECT_TOKEN }}