C4 Model + PlantUML is the the best combination. You can version your diagrams with your code (or in their own repo) using PlantUML, and by following the C4 Mo

C4 Model + PlantUML is the the best combination. You can version your diagrams with your code (or in their own repo) using PlantUML, and by following the C4 Model you create digestible diagrams that are easy to understand.