Update Cloudflare docs with instructions for adding firewall rules

[zackkrida]

Problem

Our documentation about traffic anomalies is good, but doesn't specifically instruct on how to add Cloudflare firewall rules in our infrastructure repository.

Description

Add specific instructions for managing firewall rules in Terraform to the documentation site.

https://docs.openverse.org/meta/monitoring/traffic/runbooks/identifying-and-blocking-traffic-anomalies.html

Alternatives

Additional context

[sarayourfriend]

@zackkrida would this issue be resolved, in your opinion, if a note was added to that linked document to the Terraform code, with an indication to add the rules there? Documentation beyond that would probably duplicate Cloudflare and the Terraform provider's documentation, as well as other documentation that exists in our infrastructure repository anyway.

[zackkrida]

Yes, that's completely sufficient to me!