Include MCP Portal configuration for clients

[kennyj42]

Added recommended MCP Portal configuration for clients.

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[github-actions]

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

Pattern	Owners
/src/content/docs/cloudflare-one/applications/	@kennyj42, @ranbel, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://43984895.preview.developers.cloudflare.com
Preview Branch URL: https://kennyj42-patch-4.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/applications/configure-apps/mcp-servers/mcp-portals/	https://kennyj42-patch-4.preview.developers.cloudflare.com/cloudflare-one/applications/configure-apps/mcp-servers/mcp-portals/