[draft] HCP Terraform Docs: API reference stacks in the registry

[nicsnet]

What

This PR adds a new entry for the API reference. It adds the documentation for these new APIs:

Method	Path	Action
GET	/organizations/:organization_name/registry-components	List Stack component configurations for an organization.
POST	/organizations/:organization_name/registry-components	Create a Stack component configuration (with or without VCS).
POST	/api/v2/registry-components/:component_id/versions	Create a new version of a Stack component configuration.
PUT	https://archivist.terraform.io/v1/object/<UNIQUE OBJECT ID>	Upload a Stack component configuration version archive.
GET	/api/v2/registry-components/:component_id	Get details of a Stack component configuration.
DELETE	/api/v2/registry-components/:component_id/versions/:version	Delete a specific version of a Stack component configuration.
DELETE	/api/v2/registry-components/:component_id	Delete an entire Stack component configuration.

Why

This is a new feature for the HCP Terraform private registry. It makes stacks configurations reusable across organizations.

Screenshots

• jira

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Merge Checklist

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Pull Request

• Description links to related pull requests or issues, if any.

Content

• Redirects have been added to content/terraform-docs-common/redirects.jsonc for moved, renamed, or deleted pages.
• API documentation and the API Changelog have been updated.
• Links to related content where appropriate (e.g., API endpoints, permissions, etc.).
• Pages with related content are updated and link to this content when appropriate.
• Sidebar navigation files have been updated for added, deleted, reordered, or renamed pages.
• New pages have metadata (page name and description) at the top.
• New images are 2048 px wide. They have HashiCorp standard annotation color (#F92672) and format (rectangle with rounded corners), blurred sensitive details (e.g. credentials, usernames, user icons), and descriptive alt text in the markdown for accessibility.
• New code blocks have the correct syntax and line breaks to eliminate horizontal scroll bars.
• UI elements (button names, page names, etc.) are bolded.
• The Vercel website preview successfully deployed.

Reviews

• I or someone else reviewed the content for technical accuracy.
• I or someone else reviewed the content for typos, punctuation, spelling, and grammar.

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