Replace string templates with proper json/dict configs

[angrybayblade]

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Right now we're using string templates to generate deployment builds like here

https://github.com/valory-xyz/consensus-algorithms/blob/3bc1650cce5f63bb617cb97e4c769f838f0b7f50/aea_swarm/deploy/generators/docker_compose/templates.py#L58-L85

Which seems a bit unsystematic, I propose we replace these with actual json config templates which we can dump as yaml files