docs: Document Heretto CMS integration for DITA content testing

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Adds comprehensive documentation for the new Heretto CMS integration feature, including a complete configuration guide with prerequisites, security best practices, examples, and troubleshooting. Also updates the DITA input documentation to mention Heretto as a content source for downloading and testing DITA maps. This documents the new schema additions from PR #148 in doc-detective/common.

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• doc-detective/common PR #148: Schema updates for Heretto integration

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