Remove tutorials tests that we no longer have

Makefile

@@ -123,12 +123,8 @@ test-integration: ## run tests quickly with the default Python
 test-readme: ## run the readme snippets
 	invoke readme
 
-.PHONY: test-tutorials
-test-tutorials: ## run the tutorial notebooks
-	invoke tutorials
-
 .PHONY: test
-test: test-unit test-integration test-readme test-tutorials ## test everything that needs test dependencies
+test: test-unit test-integration test-readme ## test everything that needs test dependencies
 
 .PHONY: test-all
 test-all: ## run tests on every Python version with tox