Centralize project commands to a Makefile

Makefile

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+.PHONY: \
+	clean \
+	check_code_format \
+	format_code \
+	generate_requirements_file \
+	install \
+	install_dev \
+	lint \
+	run \
+	test
+
+clean:
+	# https://stackoverflow.com/a/41386937/162086
+	python3 -Bc "for p in __import__('pathlib').Path('.').rglob('*.py[co]'): p.unlink()"; \
+	python3 -Bc "for p in __import__('pathlib').Path('.').rglob('__pycache__'): p.rmdir()"
+
+check_code_format:
+	python3 -m black --target-version=py36 --diff .
+
+format_code:
+	python3 -m black --target-version=py36 .
+
+generate_requirements_file:
+	python3 -m piptools compile --output-file=requirements.txt
+
+install:
+	python3 -m pip install -r requirements.txt
+
+install_dev:
+	python3 -m pip install -e ".[dev]"
+
+lint:
+	python3 -m flake8
+
+run:
+	python3 ./manage.py runserver --ipv6
+
+test:
+	python3 ./manage.py test