Remove Quartz dependency if possible

While starting docsrabbit, the following log message appears:

org.quartz.core.QuartzScheduler          : Scheduler meta-data: Quartz Scheduler (v2.3.2) 'quartzScheduler' with instanceId 'NON_ │
│   Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally.                                                                                                                 │
│   NOT STARTED.                                                                                                                                                                          │
│   Currently in standby mode.                                                                                                                                                            │
│   Number of jobs executed: 0                                                                                                                                                            │
│   Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 10 threads.                                                                                                              │
│   Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered.

Since i can't figure out why docsrabbit should need a quartz scheduler, we should remove/exclude this dependency in the dependency tree.