chore(gha): comment on PR about reviews

.github/workflows/notion-migration.yaml

@@ -0,0 +1,20 @@
+name: Notion Migration
+
+on:
+  # pull_request:
+  #   types: [opened]
+  push:
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v6
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: ":warning: As we're migrating to Notion, we want to make sure that changes to the handbook are only absolutely necessary. To ensure it'is the case, it's now mandatory to get an approving review to merge a pull request."
+            })