Merge branch 'rename' into 'main'

.gitlab-ci.yml

README.md

gext/__init__.py

gext/buffer.py

gext/descriptors.py

gext/fitting.py

gext/grassmann.py

gext/main.py

setup.py

tests/test_buffer.py

tests/test_descriptor_fitting.py

tests/test_extrapolation.py

tests/test_grassmann.py