Improve docker setup by adding archivy-lite option / ability to change config

[Uzay-G]

This PR introduces several changes to the docker code:

• clean up Dockerfile
• remove healthcheck.sh (already handled in Archivy itself)
• creation of a new Dockerfile-light to use Archivy with ripgrep, not ES
• implementation of an easier way to add custom configuration, using an extra docker-compose file

[Uzay-G]

I've tested this locally:

• Dockerfile built image works with docker-compose.yml
• Dockerfile.source ^^
• Dockerfile-light works with docker-compose-light.yml
• appending -f docker-compose.custom-config.yml to compose command, with the archivy_config/ directory setup, allows users to extend the configuration

Confirmation testing from someone else on this would be great.

[Uzay-G]

@BrianGilbert this would make it much easier to do custom configuration on Docker. I'll merge it in once it's tested.

To test:

• docker build --file ./Dockerfile . --build-arg VERSION=1.5 --output type=image,name=archivy or docker build --file ./Dockerfile.source . --build-arg VCS_REF=7bd0c6ad9940502dc905a46e87f35585e6037048 --output type=image,name=archivy for source image.
• copy the image name, and replace it in the docker-compose
• docker-compose -f <docker-compose> -f docker-compose.custom-config.yml up

[Uzay-G]

Merging in, will test it more.