* 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
