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

If items do not apply to your changes, add (N/A) and mark them as complete.

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

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

[github-actions]

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[github-actions]

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[rkoron007]

Hello! So sorry for the delay in reviewing this, and apologies for the style nits. I left a few bigger comments about reorganizing content that are more important than those style nits for sure! Please let me know if anything is unclear, or feel free to push back on any suggestion that doesn't feel good to you!

[rkoron007]

Went through and added all the changes I suggested and this is looking great and ready to go in my opinion!

[rkoron007]

This is the API part of the work, the other usage docs are in this PR: #1417