docs: add Ansible IaC guide for tenant configuration

[SunsetDrifter]

Summary

• New page Configure NetBird with Ansible at /selfhosted/iac/ansible, documenting the community.ansible_netbird collection for managing tenant resources (users, groups, setup keys, policies, networks, DNS, posture checks, IdPs) declaratively against the REST API.
• New sidebar group Infrastructure as Code under Self-Host NetBird, sized to accept additional IaC tools later (e.g. Terraform).
• Cross-link from selfhosted/automated-setup.mdx so operators who just minted their first PAT see the declarative next step.

Scope notes

• Covers tenant configuration only. Fleet-installing the NetBird client on machines via Ansible is intentionally out of scope; that use case is already mentioned in manage/peers/register-machines-using-setup-keys.mdx.
• The collection works against any NetBird tenant (cloud or self-hosted); the page calls that out explicitly so the placement under Self-Host doesn't mislead cloud operators.
• Links out to upstream examples/ instead of mirroring playbooks that would rot.

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