[Samyazz]

Adds references/terraform (sidebar: Deployment & Integration, after GitLab).

• Install/auth, resource map, minimal example, deploy modes, import IDs, limitations, links.
• Source: zeropsio/terraform-provider-zerops v0.1.0 README, docs, examples.
• Example validated with terraform validate and tofu validate (v0.1.0).
• OpenTofu uses registry.terraform.io/zeropsio/zerops until the OpenTofu Registry listing lands.
• yarn build and yarn lint:content pass.