Update batch README.md (#5022)
Update batch README.md (#5022)

* Update README.md

More completely document pointing kubectl to a google cloud cluster

* Update README.md

* environment name is environment.yml not environment.yaml

* build-batch -> batch ; command was renamed

* improve readme organization; 2) deployment.yaml -> deployment.yaml.in and edit yaml.in before make batch batch-test

* minor cleanup

* addressed comments

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