Alert link in Readme leads to 404 page not found

🐛: https://docs.timber.io/app/console/alerts is 404 page not found

reference: https://github.com/timberio/timber-ruby/blame/master/README.md#L52

✅ candidate: https://docs.timber.io/app/alerts/creating/ documentation about creating alerts

✅ candidate: https://docs.timber.io/app/alerts/ alert documentation parent page

✅ : open to suggestions