Remove defaultLocalisationPose from the database and stop sending startPose

[andchiind]

Describe the improvement you would like to see
Once ISAR is able to handle navigating to its own docking stations, we no longer need to store these locations in Flotilla. It is possible we may want to still display these poses, but then they should be set based on the values sent from MQTT. In either case, we no longer need to send startPoses to the robot, and we also do not need to send "dock" and "undock" flags as ISAR can understand whether or not they are docked.

How will this change existing functionality?
It will further move dock/return home logic to ISAR from Flotilla.

How will this improvement affect the current Threat Model?
N/A