ci: remove old prod deployment script

.github/workflows/deploy-prod.yml

@@ -1,20 +0,0 @@
-name: Deploy to Production
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  vercel-deployment:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: aulneau/vercel-action@v20.0.0
-        id: vercel_prod_deployment
-        with:
-          vercel-token: ${{ secrets.VERCEL_TOKEN }}
-          vercel-org-id: ${{ secrets.VERCEL_ORG_ID }}
-          vercel-project-id: ${{ secrets.VERCEL_PROJECT_ID }}
-          scope: ${{ secrets.VERCEL_SCOPE }}
-          vercel-args: '--prod'
-          github-comment: false