Move clj-kondo hooks to their respective projects

[neshtea]

This project used to be the main entry point into clj-kondo definitions for Active Group Clojure-projects. Since then, we've moved some clj-kondo hooks to their respective projects, which is what the official docs seem to suggest.

I would like to break up the definitions here, bring them over to their respective projects, thereby making this repo obsolete.

Pros:

1. hooks, etc. can be maintained where they are most likely used
2. users benefit directly when depending on Active Group projects without having to know about this repo
3. it is kind of hard to use this repo in CI environments when using clj-kondo as a CI-step (one needs to clone this repo in CI)

Cons:

Honestly, I can't think of any.