update contributing.md link

[cnvergence]

Summary by CodeRabbit

Release Notes

• Chores
  • Updated the Contribute menu link to point to the main branch instead of latest.

[coderabbitai]

Walkthrough

A configuration file update modifies the Contribute menu link references from pointing to the "latest" branch to the "main" branch in two locations, changing the resolved URL targets.

Changes

Cohort / File(s)	Summary
Configuration Updates config.toml	Updated Contribute menu link branch references from latest to main in the [menu.main] section (2 locations).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Hops and whistles while nibbling a carrot 🥕
A config tweak so neat and so fine,
From "latest" we hop to the "main" line,
Menu links dancing, all aligned,
Contribution paths now refined! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating a link related to contributing documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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