Fix dependency loop and update README

Updates the README to clarify installation and running steps. Adds a few steps that were missing or I think could help clarify instructions.

Fixes #21 even though Managed VMs still don't deploy correctly, I will open a separate issue for what I see now.

Also removed the dependency of `"gcloud-node-todos": "*"` in the cli because this results in a infinite-loop of node_modules that deploying to managed vms isn't smart enough to detect.
Had to run this command to deploy properly in addition to running `gcloud preview app setup-managed-vms` (above)