Create list of (small) tasks to refactor our project

[bitionaire]

https://github.com/golang-standards/project-layout

[liza-kl]

Probably related to https://github.com/orgs/inovex/projects/4/views/1?sortedBy%5Bdirection%5D=asc&sortedBy%5BcolumnId%5D=Status&pane=issue&itemId=64129320 (?)

[SelinaBuff]

Infos from "Go Standard Project Layout [#4166]"

Discussed in #3281

Originally posted by BenedictHomuth August 11, 2023
Our current backend is not quite conform with a standard / "best practice" Go project layout.

We should make it so by taking inspiration from: https://github.com/golang-standards/project-layout

[SelinaBuff]

@mateo-ivc what do you think?