docs: add comprehensive documentation analysis and improvement plan

[ZerocouldBR]

Add detailed documentation analysis identifying critical issues and opportunities for improvement in the Ansible documentation structure.

New documents:

• DOCUMENTATION_ANALYSIS.md: Detailed analysis of current documentation structure, identifying 9 critical problems and 15+ improvement opportunities with prioritization and implementation estimates

• DOCUMENTATION_GUIDE.md: Complete navigation guide for users at all levels (beginners to developers), with learning paths, directory structure explanation, and quick start guides

• IMPROVEMENT_ROADMAP.md: 6-month roadmap with 4 phases and 12 sprints, including specific tasks, deliverables, metrics, and risk management

• STUB_FILES_INVENTORY.md: Complete inventory of 54 stub/redirect files in user_guide/ with detailed removal plan and validation checklist

Changes:

• README.md: Added links to new documentation resources and clear explanation of documentation structure with deprecated sections

Key findings:

• 25+ stub files in user_guide/ need removal
• Two competing structures (deprecated user_guide vs new guides)
• Windows documentation fragmented across 3+ locations
• Collections documentation needs consolidation
• Installation guide needs significant expansion

Improvement priorities:

1. CRITICAL: Remove stubs and consolidate user_guide
2. HIGH: Reorganize Windows docs, split large files, expand installation
3. MEDIUM: Create learning paths, integrate network docs, expand FAQ
4. LOW: Archive old porting guides, add new content formats

This analysis forms the foundation for systematic documentation improvements over the next 6 months, focusing on user experience, navigation clarity, and content completeness.

[ansible-documentation-bot]

Thanks for your Ansible docs contribution! We talk about Ansible documentation on Matrix at #docs:ansible.im if you ever want to join us and chat about the docs! We meet on Matrix every Tuesday. See the Ansible calendar for meeting details. We welcome additions to our weekly agenda items too. You can add the dawgs-meeting tag to a forum topic to bring it up at the next meeting.