minor: Update readme badges

Author: stephane-caron

README.md

@@ -15,16 +15,12 @@ Importing a description for the first time automatically downloads and caches fi
 
 ### From conda-forge
 
-[![Conda Version](https://img.shields.io/conda/vn/conda-forge/robot_descriptions.svg)](https://anaconda.org/conda-forge/robot_descriptions)
-
 ```console
 conda install -c conda-forge robot_descriptions
 ```
 
 ### From PyPI
 
-[![PyPI version](https://img.shields.io/pypi/v/robot_descriptions)](https://pypi.org/project/robot_descriptions/)
-
 ```console
 pip install robot_descriptions
 ```