📝 Clarification repartition of resources on a project

[trolologuy]

Where on docs.platform.sh should be changed?

Somewhere in this section: https://docs.platform.sh/overview/

What exactly should be updated?

A high-level explanation regarding resource usage and the relationship between containers and how they make up a project could be a nice addition (with a diagram). For instance, how resources are split across containers, how environments are structured, how performance can be monitored, ...

Additional context

https://github.com/platformsh/platformsh-docs/pull/2540#discussion_r976407727