docs: Add custom Docker images documentation for multi-language support

[haroldfabla2-hue]

Description

This PR adds comprehensive documentation for building custom Docker images in Presidio, addressing issue #1663.

Changes Made

• Added new section "Building Custom Docker Images" to
• Documented how to modify YAML files for custom configurations
• Added guide for supporting additional languages beyond English
• Included troubleshooting section for common issues:
  • Memory problems when adding 10+ languages
  • NLP recognizer warnings
  • Model not found errors

Related Issue

Fixes #1663

Testing

Documentation build was verified locally.

Screenshots

N/A - Documentation only

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Contributed on behalf of Silhouette Team (Alberto Farah)

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