Rename operations to infrastructure
https://about.gitlab.com/handbook/operations/ to https://about.gitlab.com/handbook/infrastructure/
Also rename all inbound links.
/cc @pcarranza
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
https://about.gitlab.com/handbook/operations/ to https://about.gitlab.com/handbook/infrastructure/
Also rename all inbound links.
/cc @pcarranza