We should have development (code decision) / architecture docs

[KevinMGranger]

Although we have developer docs for various workflows and environment setup, we should have documentation about the internal architecture, our utilities and patterns, etc.

• [ ] Documenting existing code design (e.g. if you want to do a new committime exporter, inherit from AbstractCommitCollector)
• [ ] Documenting existing architectural decisions (e.g. why we use a custom config loader, typing, etc.)
• [x] Use ADRs for future proposals. And maybe also for part 2!

[mateusoliveira43]

@KevinMGranger is this resolved by https://pelorus.readthedocs.io/en/latest/Development/#architectural-decision-records ?

[KevinMGranger]

@mateusoliveira43 only the last checkbox.