Simplify installation instructions in README (#10559)
Simplify installation instructions in README (#10559)

* Simplify installation instructions in README

Also link to the latest Python 3 documentation for pip, instead of the Python 3.6 documentation.

* Improve installation instructions in README

* Fix integrity

Co-authored-by: Frédéric Collonval <07d6b77314268a069766cdc1a438f5e901aa04d7@gmail.com>
jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab