Audit & Remove Dead Links Across the Entire Repo

[dipakkr]

Hi everyone! 👋

This repo has grown to 1,300+ commits of accumulated links over many years — which is amazing! But with that growth comes inevitable link rot. A lot of those URLs are almost certainly broken by now:

• Courses that have been taken down
• Platforms that have shut down
• YouTube channels that were deleted
• Free tiers that no longer exist
• Domains that have expired

This is affecting the experience for folks who rely on this repo as a trusted resource, and it's time for a cleanup.

What Needs To Be Done

• Write or use an existing link-checker script (e.g. markdown-link-check, linkchecker) to scan all .md files
• Go section by section and flag broken URLs
• Replace links where a valid alternative exists
• Remove links where no alternative is found
• Submit a PR with the changes, grouped by section for easy review

If you have any better idea, please suggest in comments.