[Documentation] Document the dependencies of the in-vehicle stack

[ladatz]

Description

Add documentation about the dependencies in the in-vehicle stack. In particular, explain the explicit order in which the services need to be started and why

Expected outcome

Users can clearly understand which order the in-vehicle stack services need to be started in and their dependencies on each other.

Basic idea:

1. Chariott and Mosquitto Broker need to be started first (no preference on order today)
2. Agemo
3. Ibeji
4. Freyja

Additional Information

Tasks