high-available-webapps: disable webapp in existing deployment

[upgradingdave]

The Makefile for the high-available-webapps profile copies the current deployments and then creates a new deployment containing only the webapp.

The existing deployment still contains webapp + importers & exporters.

It might be nice to also update the existing deployment so that the webapp is disabled. That way, there'd be a clean separation where one deployment has only webapps, and the other deployment contains only importer/exporters

cc: @ManuelDittmar