Fix: Job to check invoice due dates was never run

Made it a command so it runs with the scheduler

routes/api.php

@@ -11,7 +11,6 @@
 use App\Http\Controllers\TodoController;
 use App\Http\Controllers\UnitController;
 use App\Mail\OrderConfirmation;
-use App\Services\CaldavService;
 use App\Http\Controllers\TimesheetController;
 use App\Http\Controllers\TimesheetEntryController;
 use App\Http\Controllers\PipelineController;