docs: Update Node.js Version to 20.x (LTS) in Development Environment Setup Instructions

[SinghaAnirban005]

Proposed changes (including videos or screenshots)

• Updated the Node.js version in the README's "Local Development" (Prerequisites) section from 14.x (LTS) to 20.x (LTS) version.
• Added a link to the official Node.js download page for easy access to the current LTS version.

Issue(s)

Closes #33803

[dionisio-bot]

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