Revert to using named volumes

[cgardens]

Tell us about the problem you're trying to solve

docker-compose pushed an update that has made local volumes unusable on mac (issue: docker/compose#7867). That has forced us to remove the use of local named volumes and instead mount raw directories. This precipcated a bunch of hacks (PR: #576)

Describe the solution you’d like

• Once docker-compose has addressed this issue, we should bring back local named volumes.
• We should also get rid of the dependency between *_DOCKER_MOUNT and *_ROOT. Currently if a directory is being mounted, these two env variables need to be set to be the same absolute path.

[cgardens]

we have gone ahead and went full to using volumes.

[tom-haines]

@cgardens re docs/info, issue is still marked as a TODO see .env.dev in v0.50.30 (just fyi)

[joceliovieira]

any updates?