Remove 'store_events' command

this command to store all events on the local filesystem was useful
while 'scaffolding'; getting my hands on some initial event-data in
the early days of Bugsink, but it was never meant as a permanent tool

events/management/commands/store_events.py

@@ -1,24 +0,0 @@
-import os
-
-from django.core.management.base import BaseCommand
-
-from events.models import Event
-
-
-class Command(BaseCommand):
-
-    def add_arguments(self, parser):
-        parser.add_argument('path', type=str)
-        parser.add_argument('--project_id', type=int)
-
-    def handle(self, *args, **options):
-        path = options['path']
-        project_id = options['project_id']
-
-        events = Event.objects.all()
-        if project_id:
-            events = events.filter(project_id=project_id)
-
-        for event in events:
-            with open(os.path.join(path, f'{event.event_id}.json'), 'w') as f:
-                f.write(event.get_raw_data())