Rollback Changes

Sometimes a deploy has unexpected results. In this case we deployed a developer preview. This is not what we want in production. So lets rollback our changes.

Run kubectl rollout undo deployment calculator-frontend to revert the latest changes.
Continuously refresh the page after applying the changes.
The page will be served with different layouts. This is because sometimes a pod with v3 and sometimes a pod with v1 answers your request.
After some time only v1 of the calculator frontend should be visible.
You can verify this by running kubectl rollout status deployment calculator-frontend:
```
deployment "calculator-frontend" successfully rolled out
```