[Fundamentals] Add Configuration Rules instructions for Markdown for Agents

[dinasaur404]

Summary

• Adds instructions for enabling Markdown for Agents on specific subdomains or paths using Configuration Rules
• Updates both Dashboard and API tabs in the partial with new subsections

Users can now granularly control where Markdown for Agents is enabled rather than only at the zone level.

[github-actions]

This PR requires additional review attention because it affects the following areas:

Partials

This PR updates partial files, which are pieces of content used across multiple files in our Render component.

• fundamentals/markdown-for-agents - view affected files

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*	@cloudflare/pcx-technical-writing

[dinasaur404]

/bonk review and suggest fixes

[ask-bonk]

Overall this looks good. The content is accurate, headings are correctly nested (H3 under the parent page's H2), links are valid, and the API example is well-structured. A few minor suggestions below.

[ask-bonk]

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[ask-bonk]

Review posted successfully. Here's a summary:

Review Summary for PR #28491

Overall: The PR is well-written and ready to merge with minor suggestions. No build breakers or content accuracy issues found.

What looks good:

• Heading hierarchy is correct (H3 under the parent page's H2 ## How to enable)
• All internal links are valid (/rules/configuration-rules/, /rules/configuration-rules/create-api/, /ruleset-engine/rules-language/)
• API example is well-structured with correct endpoint and payload
• Placeholder style ({zone_id}, {api_token}) is consistent with the existing Custom Hostnames tab
• MDX syntax is clean — no unescaped special characters in prose
• "select" used correctly for UI actions, UI elements are bolded

3 suggestions posted (all LOW severity):

1. Line 20: "Log into" should be "Log in to" per style guide (pre-existing pattern in file, but worth fixing in new content)
2. Line 23: Minor rewording of the step for selecting Create rule > Configuration Rule for clarity
3. Line 63: The starts_with(...) expression is already in backticks — this one was a false positive on my part since the expression was already properly formatted in the inline code

Pre-existing issue noted (not flagged on PR): The original API tab uses {zone_tag} while the rest of the file and the broader docs convention use {zone_id}. The new code correctly uses {zone_id} — no action needed in this PR.

github run

[github-actions]

Preview URL: https://2db4a3e1.preview.developers.cloudflare.com
Preview Branch URL: https://dina-markdown-agents-config-rules.preview.developers.cloudflare.com