Add link to 'storage in pictures' article

docs/Docs.md

@@ -39,6 +39,7 @@
 ## Articles
 - [Where are my entities and components](https://ajmmertens.medium.com/building-an-ecs-1-where-are-my-entities-and-components-63d07c7da742)
 - [Archetypes and vectorization](https://ajmmertens.medium.com/building-an-ecs-2-archetypes-and-vectorization-fe21690805f9)
+- [Storage in pictures](https://ajmmertens.medium.com/building-an-ecs-storage-in-pictures-642b8bfd6e04)
 - [Making the most of entity identifiers](https://ajmmertens.medium.com/doing-a-lot-with-a-little-ecs-identifiers-25a72bd2647)
 - [Building games in ECS with entity relationships](https://ajmmertens.medium.com/building-games-in-ecs-with-entity-relationships-657275ba2c6c)
 - [Why it is time to start thinking of games as databases](https://ajmmertens.medium.com/why-it-is-time-to-start-thinking-of-games-as-databases-e7971da33ac3)