docs: add warning about alpha status to terraform registry facing docs

[jasonwashburn]

Description

Add the warning from README.md to the provider documentation so that it correctly surfaces to viewers on the Terraform registry.

NOTE: the syntax for markdown on Terraform's registry site is slightly different than GitHub's for callouts.
Ref: https://developer.hashicorp.com/terraform/registry/providers/docs#callouts

Related issue

N/A

Type of change

• Bug fix
• New feature
• Documentation
• Refactoring or maintenance

Validation

Validate warning appears in both the provider index document as well as the uds_package resource docs upon next release. (Docs on terraform registry are tied to versioned releases)

Checklist

• Tests, documentation, and ADRs were added or updated as needed
• Generated provider documentation is up to date
• I followed the contributor guide

[greptile-apps]

Greptile Summary

Adds a consistent alpha-status warning to Terraform Registry-facing provider and uds_package resource documentation.

• Adds the warning to both generated Markdown documents.
• Updates the corresponding templates so future documentation generation preserves the warning.

Confidence Score: 5/5

The documentation-only change appears safe to merge.

The generated documentation and its source templates contain matching warning text, with no runtime or security behavior changed.

Important Files Changed

Filename	Overview
docs/index.md	Adds the alpha-status warning to the generated provider index.
docs/resources/package.md	Adds the same warning to the generated uds_package resource documentation.
templates/index.md.tmpl	Preserves the provider warning during future documentation generation.
templates/resources/package.md.tmpl	Preserves the resource warning during future documentation generation.

_{Reviews (1): Last reviewed commit: "docs: add warning about alpha status to ..." | Re-trigger Greptile}

[Copilot]

🟢 Approval recommended

Documentation-only change with consistent, valid Terraform Registry callout formatting applied in both templates and generated docs.

Pull request overview

Adds an explicit Terraform Registry-style warning callout to the rendered provider and uds_package docs so the provider’s alpha status is visible to registry readers (not just the repo README).

Changes:

• Inserted a ~> **Warning:** alpha-status callout into the provider index template and generated docs/index.md.
• Inserted the same warning callout into the uds_package resource template and generated docs/resources/package.md.

File summaries

File	Description
templates/resources/package.md.tmpl	Adds alpha-status warning callout to the uds_package resource documentation template output.
templates/index.md.tmpl	Adds alpha-status warning callout to the provider index documentation template output.
docs/resources/package.md	Updates generated uds_package docs to include the warning callout.
docs/index.md	Updates generated provider index docs to include the warning callout.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 0
• Review effort level: Lite

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