Refactor developer convenience scripts (#1377)

* Cleanup the backend-dev convenience method

* Add the frontend_dev convenience method

frontend_dev is a soup-to-nuts convenience method for setting up the FE
development environment with node running a the client code on port 3000
with the a separate cellxgene package serving the API over port 5005 in
the background.

The script can be run from Finder.

* Update the developer scripts documentation

* Remove the 'test' make target in the client Makefile

Rationale:
* Given how long the smoke tests take to run, it is unlikely that
  developers will want to run all tests together.
* It is unlikely that developers will have set up the backend server
  properly for the tests to pass.
* Available commands should be safe-ish and not lend themselves to
  confusing errors.
* You can still group tests by concatenating them in a make command, as
  in `make unit-test smoke-test`.
* This target isn't used in any of our CI pipelines -- KISS.

* Some version of python3...

* Minor typos in docs

* Respond to feedback from @bkmartinjr

* Make adjustments so that DATASET path is predictable

* Simplify environment defaults a bit

client/Makefile

@@ -4,7 +4,6 @@ ifeq ($(shell uname),Darwin)     # is Windows_NT on XP, 2000, 7, Vista, 10...
     IS_DARWIN := "true"
 endif
 
-DATASET := $(if $(DATASET),$(DATASET),../example-dataset/pbmc3k.h5ad)
 ANNOTATIONS := $(if $(ANNOTATIONS),$(ANNOTATIONS),../server/test/test_datasets/pbmc3k-annotations.csv)
 ANNOTATIONS_FILENAME := $(shell basename $(ANNOTATIONS))
 
@@ -38,36 +37,10 @@ lint-diff:
 
 
 # Development convenience methods
-
-.PHONY: server-requirements
-server-requirements:
-	virtualenv -p python3 ../venv
-	source ../venv/bin/activate && \
-		pip install -r ../server/requirements-dev.txt && \
-		yes | pip uninstall cellxgene || true && \
-		pip install -e ..
-
 .PHONY: start-frontend
 start-frontend:
 	node server/development.js
 
-.PHONY: start-server
-start-server:
-	cellxgene launch -p $(CXG_SERVER_PORT) $(CXG_OPTIONS) $(DATASET)
-
-.PHONY: backend-dev
-backend-dev: server-requirements
-	source ../venv/bin/activate && CXG_OPTIONS='--debug' $(MAKE) start-server
-
-.PHONY: backend-dev-anno-ontology
-backend-dev-anno-ontology: server-requirements
-	CXG_OPTIONS='--experimental-annotations-ontology --debug' \
-		$(MAKE) backend-dev
-
-.PHONY: test
-test:
-	node node_modules/jest/bin/jest.js
-
 .PHONY: e2e
 e2e:
 	node node_modules/jest/bin/jest.js \