docs: remove references to deprecated Cloudflare Apps

[markjmiller]

Summary

Cloudflare Apps has been sunset. There are some references here that need to be removed.

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Removed references to deprecated Cloudflare Apps throughout the documentation.

• Eliminated the section on billing for Cloudflare Apps in the usage-based billing documentation.
• Removed mentions of Cloudflare Apps in the network ports reference.
• Deleted references to Cloudflare Apps in the content security policies documentation.
• Removed cautionary notes regarding Cloudflare Apps in the error 1014 troubleshooting guide.

Modified Files

• src/content/docs/billing/usage-based-billing.mdx
• src/content/docs/fundamentals/reference/network-ports.mdx
• src/content/docs/fundamentals/reference/policies-compliances/content-security-policies.mdx
• src/content/docs/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/error-1014.mdx

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[github-actions]

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

Pattern	Owners
*	@cloudflare/pcx-technical-writing
/src/content/docs/fundamentals/	@dcpena, @cloudflare/pcx-technical-writing
/src/content/docs/support/	@zeinjaber, @TracyCloudflare, @ngayerie, @cloudflare/pcx-technical-writing, @cloudflare/customer-support

[github-actions]

Preview URL: https://d3fee8b7.preview.developers.cloudflare.com
Preview Branch URL: https://markmiller-remove-cloudflare-apps-references.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/fundamentals/reference/policies-compliances/content-security-policies/	https://markmiller-remove-cloudflare-apps-references.preview.developers.cloudflare.com/fundamentals/reference/policies-compliances/content-security-policies/
https://developers.cloudflare.com/billing/usage-based-billing/	https://markmiller-remove-cloudflare-apps-references.preview.developers.cloudflare.com/billing/usage-based-billing/
https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/error-1014/	https://markmiller-remove-cloudflare-apps-references.preview.developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/error-1014/
https://developers.cloudflare.com/fundamentals/reference/network-ports/	https://markmiller-remove-cloudflare-apps-references.preview.developers.cloudflare.com/fundamentals/reference/network-ports/