Remove dark mode logo from the PyPI long description

setup.cfg

@@ -3,7 +3,6 @@ name = coolest
 version = attr: coolest.VERSION
 author = Aymeric Galan & COOLEST contributors
 description = Standard for Strong Gravitational Lensing Analyses
-long_description = file: README.md, HISTORY.md, LICENSE.md
 license = BSD-3-Clause
 url = https://github.com/aymgal/coolest
 keywords = coolest, lensing, gravitation, astrophysics