docs: More fundle docs

[geeknoid]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances the documentation for the Fundle dependency injection library by expanding the introductory module documentation with comprehensive explanations of dependency injection concepts, comparisons with traditional DI frameworks, and Fundle's specific approach.

• Adds detailed explanations of what dependency injection is and why it matters
• Compares Fundle's compile-time approach with classic runtime DI frameworks
• Documents how Fundle achieves zero-cost abstractions and compile-time safety

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (7c11189) to head (47c1cbc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   100.0%   100.0%           
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  Files          14       14           
  Lines        1414     1414           
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  Hits         1414     1414           

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