PSMDB-1743 Documented integration with Imperva DSF

[nastena1606]

modified: mkdocs-base.yml

   New file:   docs/imperva.md

[Copilot]

Pull Request Overview

This PR adds documentation for integrating Percona Server for MongoDB Pro with Imperva Data Security Fabric (DSF), providing enterprise-grade auditing and monitoring capabilities. The documentation explains how the integration works, its benefits, version compatibility, and setup instructions.

Key changes:

• Added new documentation file explaining Imperva DSF integration
• Restructured navigation to group audit-related documentation under an "Auditing" section

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
mkdocs-base.yml	Restructured navigation to create an "Auditing" section containing audit logging and Imperva DSF integration
docs/imperva.md	New documentation file explaining Imperva DSF integration, benefits, compatibility, and configuration

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