Update repo README for latest requirements and setup

[parlough]

Resolves #12869

[gemini-code-assist]

Summary of Changes

Hello @parlough, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the clarity and accuracy of the repository's README.md file. It updates outdated links, refines contribution instructions, and provides a more comprehensive guide for verifying content, ensuring that new and existing contributors have the most current information for setting up their development environment and maintaining the project.

Highlights

• Documentation Updates: The README.md file has been updated to reflect the latest requirements and setup procedures for the repository.
• Link Correction: The link for 'Upgrading Flutter' has been corrected to point to the appropriate documentation page.
• Prerequisites Streamlined: The mention of Node.js as a prerequisite for setting up the local environment has been removed, simplifying the setup instructions.
• Enhanced Link Checking Guide: The 'Check links' section has been significantly expanded into a detailed, step-by-step guide, including instructions for building the site, verifying Markdown link references, and validating internal links, along with a note about the Firebase CLI.

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[sfshaza2]

lgtm

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 64683dd):

https://flutter-docs-prod--pr12884-misc-update-repo-readme-31u42gl4.web.app