docs: Update Node.js version requirement to 18.20.0+ for WebDriverIO v9 compatibility

[promptless]

Update the minimum Node.js version requirement from 18.0.0 to 18.20.0 to ensure compatibility with the upgraded WebDriverIO v9.19.2 dependency. This change affects both the installation documentation and the package.json engines field to maintain consistency across the project.

Trigger Events

• doc-detective/core PR #353: Bump webdriverio from 8.45.0 to 9.19.2

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[hyperlint-ai]

PR Change Summary

Updated Node.js version requirement to ensure compatibility with WebDriverIO v9.

• Increased minimum Node.js version from 18.0.0 to 18.20.0
• Updated installation documentation to reflect the new Node.js version
• Modified package.json to maintain consistency with the new version requirement

Modified Files

• docs/get-started/installation.md

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[promptless]

I've added the requested changes in commit 5877c82