Add Dendron features comparison analysis (#122)

* Add Dendron features comparison analysis

- Comprehensive comparison of Dendron vs Noted features
- Identifies 12 key feature gaps with priority and complexity ratings
- Includes implementation roadmap for phases 1-4
- Highlights Noted's unique AI-powered advantages
- Provides feature comparison matrix and recommendations

* Update dendron-features-comparison.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update dendron-features-comparison.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Add internal navigation links to Summary section

- All feature names in Summary & Recommendations now link to detailed sections
- Improves document navigability for long-form reading
- Makes it easier to jump between summary and detailed analysis

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Co-authored-by: Claude <[email protected]>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: 3 people