Fix installation instruction in doc

Author: bgoujaud

README.md

@@ -1,9 +1,6 @@
 # PEPit: Performance Estimation in Python
 
 [![PyPI version](https://badge.fury.io/py/PEPit.svg)](https://pypi.python.org/pypi/PEPit/)
-[![Build Status](https://github.com/bgoujaud/PEPit/workflows/build/badge.svg?branch=master&event=push)](https://github.com/bgoujaud/PEPit/actions)
-[![Codecov Status](https://codecov.io/gh/bgoujaud/PEPit/branch/master/graph/badge.svg)](https://codecov.io/gh/bgoujaud/PEPit)
-[![Downloads](https://pepy.tech/badge/pepit)](https://pepy.tech/project/pepit)
 [![License](https://img.shields.io/github/license/bgoujaud/PEPit.svg)](https://github.com/bgoujaud/PEPit/blob/master/LICENSE)
 
 This open source Python library provides a generic way to use PEP framework in Python.

docs/source/quickstart.rst

@@ -31,10 +31,6 @@ PEPit is available on pypi, hence can be installed very simply by running
 
 ``pip install pepit``
 
-To solve the SDPs, PEPit relies on CVXPY [5, 6]. Please also run
-
-``pip install cvxpy``
-
 Now you are all set!
 You should be able to run