Remove normalizers submodule

.gitmodules

MANIFEST.in

default_plugins.txt

dependencies/normalizers/simulation/band_structure

dependencies/normalizers/simulation/dos

dependencies/normalizers/simulation/soap

dependencies/normalizers/simulation/spectra

dependencies/normalizers/simulation/system

dependencies/normalizers/simulation/workflow

gui/tests/env.js

nomad/config/defaults.yaml

nomad/normalizing/__init__.py

nomad/normalizing/optimade.py

pyproject.toml

tests/test_config.py