docs: add cheat sheet to the root level navigation

[IdrisGit]

The Cheat Sheet is very useful for a quick lookup, but it's hidden in the docs without any direct navigation or mention somewhere.

I got to know about it from Google search results and had bookmarked it.

This PR adds it to the root (Getting Started) section of the docs with navigation entry.

Summary by CodeRabbit

• Documentation
  • Added a Cheat Sheet section to the Getting Started navigation for quick access to reference materials.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

A new sidebar navigation entry titled "Cheat Sheet" linking to /cheat-sheet has been added to the Getting Started section of the VitePress documentation configuration. This is a configuration-only change affecting navigation structure.

Changes

Cohort / File(s)	Change Summary
Documentation Configuration docs/.vitepress/config.ts	Added Cheat Sheet sidebar navigation item under Getting Started section with link to /cheat-sheet

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A cheat sheet hops into the guide,
Where quick tips and tricks now reside,
Navigation blooms, so neat and bright,
One small config makes learning light! ✨

🚥 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: adding a cheat sheet entry to the root level navigation in the documentation sidebar.
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 docstrings

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