feat: Overseerr to Jellyseerr migration (#2019)

* feat: add Overseerr migration

* refactor: rename to Seerr

* refactor: more rename to Seerr

* feat: update the value of the MediaStatus.DELETED enum

* fix: add more details in migration logs

* fix: replace .update by .save for TypeORM hooks

* fix: add fake migration to skip the duplicated UpdateWebPush migration

* fix: rewrite the AddUserAvatarCacheFields migration for Overseerr merge

* fix: replace jellyseerr migrations with a dedicated one for overseerr

* fix: update overseerr migration

* fix: update overseerr migration

* fix: remove irrelevant changes

* fix: typos

* docs: update jsdoc comment

* docs: update seerr description

* docs: fix the contributing.md link

* fix: remove unwanterd change on postgres dev datasource

* docs: add latest tag to docker image

* fix: migrate old deleted status for 4k media

* fix: update Seerr version check

docs/using-seerr/notifications/slack.md

@@ -0,0 +1,17 @@
+---
+title: Slack
+description: Configure Slack notifications.
+sidebar_position: 9
+---
+
+# Slack
+
+## Configuration
+
+### Webhook URL
+
+Simply [create a webhook](https://my.slack.com/services/new/incoming-webhook/) and enter the URL in this field.
+
+:::info
+Please refer to the [Slack API documentation](https://api.slack.com/messaging/webhooks) for more details on configuring these notifications.
+:::