README links point to outdated URLs that redirect

[shujanislam]

Some links in the README currently point to older documentation URLs. While they still work via redirects, they add an unnecessary redirect hop and may become fragile if redirects change in the future.

Example link updates

Old: https://vercel.community
New: https://community.vercel.com/

Old: https://vercel.com/docs/rest-api
New: https://docs.vercel.com/docs/rest-api/reference/welcome

Proposed fix

• Update the README links to their current canonical URLs.

• No content or behavior changes — documentation-only improvement.

• I’m happy to submit a PR with the updated links if this looks good