Add magentic third-party integration docs page

[jackmpcollins]

https://github.com/jackmpcollins/magentic supports logfire thanks to the logfire-api package. More details https://magentic.dev/logging-and-tracing/

This follows similar style to the existing third-party integrations docs pages. Original suggestion to add magentic to the docs: #121 (comment)

screenshot

[hyperlint-ai]

1 files reviewed, 2 total issue(s) found.

The style guide flagged several spelling errors that seemed like false positives. We skipped posting inline suggestions for the following words:

• Magentic

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8785c6b) to head (8778438).
Report is 1 commits behind head on main.

Additional details and impacted files

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##              main      #584   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          133       133           
  Lines        10567     10567           
  Branches      1450      1450           
=========================================
  Hits         10567     10567           

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[hyperlint-ai]

The style guide flagged several spelling errors that seemed like false positives. We skipped posting inline suggestions for the following words:

• Magentic

[hyperlint-ai]

1 files reviewed, 2 total issue(s) found.

---

Note: We resolved prior Hyperlint review comments because:

We noticed a change to the style guide files.

We do this to avoid keeping outdated or irrelevant comments around. We'll leave a new review with current comments below.

[hyperlint-ai]

The style guide flagged several spelling errors that seemed like false positives. We skipped posting inline suggestions for the following words:

• LLMs