Add NPM package link and improve badge styling in README#6

bookernath merged 2 commits into

mainbookernath/cached-middleware-fetch-next:mainfrom

copilot/fix-76f75291-ad7d-4e45-bf98-0804465c907dbookernath/cached-middleware-fetch-next:copilot/fix-76f75291-ad7d-4e45-bf98-0804465c907dCopy head branch name to clipboard