Add CI/CD pipeline for deploying governance docs to WordPress

[JohnRDOrazio]

Summary

Set up GitHub Actions CI/CD to deploy the governance documentation to the CDCF WordPress site and produce downloadable artifacts.

Requirements

• Deploy as WordPress pages under parent pages (ai-governance, project-governance, standards) — these will be linked in the frontend navbar
• Change detection — only deploy documents that changed since the previous tag
• Translation — translate deployed pages to it, es, fr, pt, de via cdcf/v1/translate
• Standalone HTML — individual HTML files per document with cross-navigation links
• Combined PDF — single PDF covering all governance documents with internal links
• GitHub Release — attach HTML and PDF artifacts to tag-based releases
• Markdown linting — lint on push/PR matching the pattern from sibling repos

Documents covered

AI Governance (4)

• ai-governance/ai-vetting-criteria.md
• ai-governance/fragmented-catholic-ai-governance.md
• ai-governance/governance-as-code-catholic-ai.md
• ai-governance/trusted-synthetic-data-ministry-ai.md

Project Governance (5)

• project-governance/definitions.md
• project-governance/project-types.md
• project-governance/lifecycle.md
• project-governance/project-vetting-criteria.md
• project-governance/committees.md

Standards (2)

• standards/overview.md
• standards/committees.md

References

Follows the deployment pattern established in:

• foundation-bylaws (deploy-bylaws.yml)
• foundation-manifesto (deploy-manifesto.yml)
• foundation-logo (deploy-logo-symbolism.yml)