setuptools recognises src these days, no config is needed. (#4206)

* setuptools recognises src these days, not config is needed.
Aded separate package command that follows the guide at https://github.com/django-oscar/django-oscar/wiki/Releasing

* removed unused function

Makefile

 
 # These targets are not files
 .PHONY: build_sandbox clean compile_translations coverage css docs extract_translations help install install-python \
- install-test install-js lint release retest sandbox_clean sandbox_image sandbox test todo venv
+ install-test install-js lint release retest sandbox_clean sandbox_image sandbox test todo venv package
 
 help: ## Display this help message
 	@echo "Please use \`make <target>\` where <target> is one of"
 	-grep -rnH TODO src/oscar/apps/
 	-grep -rnH "django.VERSION" src/oscar/apps
 
-release: clean ## Creates release
-	pip install twine wheel
-	rm -rf dist/*
-	rm -rf src/oscar/static/*
+package: clean
+	pip install --upgrade pip twine wheel
+	npm ci
+	rm -rf src/oscar/static/
+	rm -rf dist/
+	rm -rf build/
 	npm run build
+	python setup.py clean --all
 	python setup.py sdist bdist_wheel
+
+release: package ## Creates release
 	twine upload -s dist/*

setup.py

 import re
 import sys
 
-from setuptools import find_packages, setup
+from setuptools import setup
 
 PROJECT_DIR = os.path.dirname(__file__)
 
     keywords="E-commerce, Django, domain-driven",
     license='BSD',
     platforms=['linux'],
-    package_dir={'': 'src'},
-    packages=find_packages('src'),
     include_package_data=True,
     python_requires='>=3.8',
     install_requires=install_requires,