Remove other unused rules in Makefile

These aren't referenced anywhere. Some are repeated in other rules,
and if necessary it should be easy to type the commands.

Makefile

@@ -43,28 +43,10 @@ virtualenv:
 upgrade-pip: virtualenv
 	${VIRTUALENV_ROOT}/bin/pip install --upgrade pip
 
-.PHONY: requirements
-requirements: upgrade-pip requirements.txt ## Install dependencies for running the app
-	${VIRTUALENV_ROOT}/bin/pip install -r requirements.txt
-
-.PHONY: requirements-for-test
-requirements-for-test: upgrade-pip requirements_for_test.txt ## Install all dependencies for running the app, development and testing
-	${VIRTUALENV_ROOT}/bin/pip install -r requirements_for_test.txt
-
-.PHONY: frontend
-frontend:
-	npm set progress=false
-	npm install
-	npm rebuild node-sass
-
 .PHONY: generate-version-file
 generate-version-file: ## Generates the app version file
 	@echo -e "__git_commit__ = \"${GIT_COMMIT}\"\n__time__ = \"${DATE}\"" > ${APP_VERSION_FILE}
 
-.PHONY: build
-build: frontend requirements-for-test generate-version-file ## Build project
-	npm run build
-
 .PHONY: test
 test: ## Run tests
 	./scripts/run_tests.sh