[Docs]: Relative Links Don't Work

Relative links in npm packages do not work.

## Repro

Go to:

https://www.npmjs.com/package/rrweb

Click link "original rrweb README"

Notice 404 (at https://github.com/rrweb-io/rrweb/README.md)

## Suggested Fix

https://github.com/rrweb-io/rrweb/blob/master/packages/rrweb/README.md