fix: add .nvmrc for Node.js 20 compatibility

[aldin4u]

Fixes the Cloudflare Pages build failure by specifying Node.js version 20 in .nvmrc file.

The build was failing because it was trying to use Node.js 20.19.6 which doesn't exist. This PR adds an .nvmrc file to explicitly specify Node.js 20, allowing Cloudflare Pages to use the latest stable 20.x version.

Resolves the build error:
```
node-build: definition not found: 20.19.6
Error: Exit with error code: 1
```

Summary by CodeRabbit

• Chores
  • Added Node.js version specification to ensure consistent development environment across team members and deployment configurations.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a .nvmrc file to the project specifying Node.js version 20. This manifest file documents the required Node.js runtime version for project development and execution.

Changes

Cohort / File(s)	Summary
Node.js Version Configuration \.nvmrc	Added .nvmrc file specifying Node.js version 20

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A dotfile so small, yet it speaks volumes clear,
Version twenty's here, no need to fear!
With .nvmrc placed with care,
Our Node versions now perfectly pair! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description provides context about the build failure and explains the solution, but does not follow the required template structure with sections for 'How Has This Been Tested?' and 'Types of changes'.	Complete the description using the template: add a 'How Has This Been Tested?' section and specify the type of change (e.g., Bug fix) in the checklist.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding an .nvmrc file to specify Node.js 20 for compatibility, which directly addresses the core objective of fixing a build failure.
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.}

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