Update Raspberry Pi comment

README.md

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 [![Build](https://img.shields.io/github/actions/workflow/status/tasts-robots/pink/main.yml?branch=master)](https://github.com/tasts-robots/pink/actions)
 [![Coverage](https://coveralls.io/repos/github/tasts-robots/pink/badge.svg?branch=master)](https://coveralls.io/github/tasts-robots/pink?branch=master)
-[![Documentation](https://img.shields.io/badge/docs-online-brightgreen?style=flat)](https://tasts-robots.org/doc/pink/)
+[![Documentation](https://img.shields.io/badge/docs-online-brightgreen?logo=read-the-docs&style=flat)](https://tasts-robots.org/doc/pink/)
 [![PyPI version](https://img.shields.io/pypi/v/pin-pink)](https://pypi.org/project/pin-pink/)
 
 **P**ython **in**verse **k**inematics for articulated robot models, based on [Pinocchio](https://github.com/stack-of-tasks/pinocchio).
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 pip install pin-pink
 ```
 
-On Raspberry Pi, you will need to install [from source](https://tasts-robots.org/doc/pink/installation.html#from-source).
-
 ## Usage
 
 Pink solves differential inverse kinematics by [weighted tasks](https://scaron.info/robot-locomotion/inverse-kinematics.html). A task is defined by a *residual* function $e(q)$ of the robot configuration $q \in \mathcal{C}$ to be driven to zero. For instance, putting a foot position $p_{foot}(q)$ at a given target $p_{foot}^{\star}$ can be described by the position residual: