Remove mention of IBM Q account URL from README (#7827)
Remove mention of IBM Q account URL from README (#7827)

While this function accepts a URL, it is not essential for basic
use, and it is not clear from the IBM Q account what URL should
be used.

Co-authored-by: mergify[bot] <b09a6ee808b67e98a221404e7aaa52e0398a4954@users.noreply.github.com>
QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py