[Maintenance] Decoupling of stack for refarch and refarch-templates

[devtobi]

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Problem description (optional)

Currently we try to mimic the stack of https://github.com/it-at-m/refarch-templates by providing a "copy" of the docker-compose file as a docker-compose-refarch-base.yml
However this assumes we will try to keep both stacks in sync in the future (which has to be done manually).
Since the development for the gateway and the integrations itself don't need the same setup as when working with the templates, we should decouple those stacks and handle them separately.

Desired solution

Merge docker-compose-refarch-base.yml and docker-compose.yml and only keep relevant images for development.

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Additional context (optional)

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