Document external custom scripts integration

[mintlify]

Summary

• Documents the new customScripts field under integrations in docs.json, which lets users load third-party JavaScript from external HTTPS URLs
• Adds a new "External scripts" section to the custom scripts page with configuration details, properties, and examples
• Adds the customScripts field reference to the integrations settings page

Triggered by a new feature that adds support for loading external scripts via docs.json configuration, giving users an alternative to committing JavaScript files directly in the repository.

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Note

Low Risk
Low risk documentation-only change that adds guidance and schema details for loading external scripts; no runtime or configuration parsing logic is modified in this PR.

Overview
Documents a new integrations.customScripts configuration for loading third-party JavaScript from external HTTPS URLs.

Adds an External scripts section to customize/custom-scripts.mdx with config shape, allowed properties (src, strategy), constraints (HTTPS, max 20, disallowed extensions), and examples, and updates organize/settings-integrations.mdx to include the customScripts field plus an example snippet.

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[ethanpalm]

Closing as duplicate of #4981. That PR is more recent and covers the same customScripts documentation. The most comprehensive version will be reviewed separately.