Update docs: add toolkit page

[dreadatour]

Add "Toolkit" page to the "API Reference" section.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.69%. Comparing base (aed4ae7) to head (5bf5e4b).
Report is 2 commits behind head on main.

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  Coverage   87.69%   87.69%           
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  Files         128      128           
  Lines       11429    11429           
  Branches     1542     1542           
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  Hits        10023    10023           
  Misses       1019     1019           
  Partials      387      387           

Flag	Coverage Δ
datachain	87.61% <ø> (ø)

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[yathomasi]

Could you add a link to to Overview page as well?

[dreadatour]

Could you add a link to to Overview page as well?

Oh 👀 Merged already 😥 I'll create another PR then, thank you for this suggestion 🤗