docs: Added missing entries in README TOC

[geeknoid]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the README table of contents to include previously missing section links. The additions improve navigation by ensuring all major sections in the document are properly referenced in the TOC.

Key changes:

• Added three conceptual section links: "What is Dependency Injection", "Classic Dependency Injection", and "How Fundle Works"
• Added "Name Origin" section link

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (afa6961) to head (facaa6b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
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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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