Delete proofread-action.yaml (#760)

Resulting in a lot of false positives (to revisit later)

.github/workflows/proofread-action.yaml

@@ -1,14 +0,0 @@
-name: Proofread PRs
-on: [pull_request]
-
-jobs:
-  test:
-    permissions: write-all # Required since GitHub now gives actions read-only permissions by default
-    runs-on: ubuntu-latest
-    name: Proofread PRs
-    steps:
-      - name: Proofread PR
-        uses: awreck/proofread-action@v1
-        id: proofread
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }} # Required to write a PR review