Update docs

[mo7zayed-f]

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[reindert-vetter]

I am working on another project this year. I actually only need to write the documentation. Sorry that the readme said otherwise. I have changed that.

Still, the code will be correct. You can run go run cmd/api/main.go api:serve (or use the dockerfile with a watcher). Then you at least have a base for your next project. A base with api routes, middleware and controllers without dependencies.

Feel free to give your opinion about the project. Your points for improvement and what you think of it.