Prerequisite instructions are inconsistent

[loic-sharma]

Describe the problem

The README's Get the prerequisites section does not mention Node.js.

However, the Set up your local environment and serve changes section states:

Before you continue setting up the site infrastructure, verify the correct versions of Flutter and Node.js are set up and available by following the instructions in Get the prerequisites.

Expected fix

It seems like Node.js is no longer needed. If that's correct, consider removing it from the README:

  Before you continue setting up the site infrastructure,
- verify the correct versions of Flutter and Node.js are set up and available by following the
+ verify the correct version of Flutter is set up and available by following the
  instructions in [Get the prerequisites](https://github.com/flutter/website?tab=readme-ov-file#get-the-prerequisites).