Documenting the initialization process

[puchka]

I think that the initialization part of the system should be documented more.

The documentation should respond to the following questions:

• How the system initialized?
• What is the order of initialization?
• How can we access configuration data from the other layers?

[soulflyer]

Is this still an issue?

[LeaveNhA]

Where is this issue's content in PRs? In the documentation, maybe?

[gmsvalente]

Reviving this as it is still pertinent.