Feature beat model (#713)

* add django-celery-beat

* implement schedule migration

* fix version_check migration

* remove old schedule init

* better schedule migration

* fix task_config migration

* show task config on settings page

* fix notify url builder

* refactor celery initiation

* fix get task

* fix scheduler mig

* fix linter

* better task_config store on periodic task

* save new schedules

* fix task_config extraction from custom model

* implement auto schedule

* implement schedule delete

* refactor notifications to ES config storage

* downgrade redis

* better notification migration to ES

* add notification url handling

* fix worker start

* fix docs spelling

* don't resend form data on notification refresh

* fix type hints

* move TASK_CONFIG to separate module

* fix partial task config imports

* fix yt_obs typing

* delete schedule

* remove outdated instructions

* create initial schedules

* fix reindex days config key

* fix doc string

* unregister BeatModels

docker_assets/run.sh

@@ -17,7 +17,7 @@ python manage.py ta_startup
 
 # start all tasks
 nginx &
-celery -A home.tasks worker --loglevel=INFO --max-tasks-per-child 10 &
+celery -A home.celery worker --loglevel=INFO --max-tasks-per-child 10 &
 celery -A home beat --loglevel=INFO \
-    -s "${BEAT_SCHEDULE_PATH:-${cachedir}/celerybeat-schedule}" &
+    --scheduler django_celery_beat.schedulers:DatabaseScheduler &
 uwsgi --ini uwsgi.ini