docs: clarify Node.js version requirement

[RudraDiyora]

Summary

Clarifies the Node.js version requirement in the installation guide to help first-time users avoid common setup issues. Also clarifies how to view the latest changes through LocalHost.

Motivation

New users may encounter confusing errors when using unsupported Node.js versions.

Test Plan

Documentation change only.

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[RudraDiyora]

Hi team,

This pull request updates the installation guide to clarify the required Node.js version for Docusaurus, helping first-time users avoid common setup issues. It also provides guidance on verifying the latest changes locally via localhost.

This is a documentation-only change; no code behavior is affected. I’ve tested the instructions locally to ensure they work as described.

Thank you for reviewing! I’m happy to make any additional adjustments if needed.

[slorber]

Sorry but I don't think this would clarify anything

New users may encounter confusing errors when using unsupported Node.js versions.

Unless you clearly show us the confusing errors they get, I believe the error message is clear enough

The engine "node" is incompatible with this module. Expected version ">=20.0". Got "16.20.2"

If you think that message is unclear, that should be reported to package managers diretly that emit it.