docs: update docs to reflect that CE is disabled by default

[ctrombley]

What

This PR updates the documentation to reflect that cost estimation is now disabled by default for new organizations.

cc @thrashr888

Merge Checklist

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

Pull Request

• One or more labels describe the type of change (e.g. clarification) and associated product (e.g. tfc).
• Description links to related pull requests or issues, if any.

Content

• (N/A) Redirects have been added for moved, renamed, or deleted pages. This requires a separate PR in the terraform-website repository redirects.next.js file.
• (N/A) API documentation and the API Changelog have been updated.
• (N/A) Links to related content where appropriate (e.g., API endpoints, permissions, etc.).
• (N/A) Pages with related content are updated and link to this content when appropriate.
• (N/A) Sidebar navigation files have been updated for added, deleted, reordered, or renamed pages.
• (N/A) New pages have metadata (page name and description) at the top.
• (N/A) 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.
• (N/A) New code blocks have the correct syntax and line breaks to eliminate horizontal scroll bars.
• (N/A) 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.

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Name	Status	Preview	Comments	Updated (UTC)
terraform-docs-common	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 28, 2023 9:47pm