Reorganize Docker services: use only FrankenPHP, add cli service

[chuckadams]

Pull Request

What changed?

• There is now just one docker-compose stack, using FrankenPHP
• A cli service now exists for running one-off commands.
• bin/dcrun exists to shorten the whole docker compose run --rm cli foofrah.
• bin/dcexec also exists for docker compose exec
  • note dcexec execs on the webapp service by default, as the cli service is not persistent

Why did it change?

Fewer config choices means less maintenance headache. The cli container will be versatile and handy.

Did you fix any specific issues?

none, this came from a slack conversation with @sarah-savage

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[sarah-savage]

This looks good. r+