Global MQTT connection configuration #707
Description
Is your feature request related to a problem? Please describe.
Currently, I have to configure the MQTT connection for every user. All users of my reitti instance share the same MQTT broker for OwnTracks, which makes this a bit cumbersome.
Describe the solution you'd like
An instance-global configuration for MQTT broker connection, shared for all users on the instance.
Describe alternatives you've considered
Configuring the same connection over and over again.
Additional context
Relates to #664