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/index.mdx

@@ -0,0 +1,25 @@
+---
+title: Notifications
+description: Configure notifications for your users.
+sidebar_position: 3
+---
+
+# Notifications
+
+## Supported Notification Agents
+
+Seerr currently supports the following notification agents:
+
+import DocCardList from '@theme/DocCardList';
+
+<DocCardList />
+
+## Setting Up Notifications
+
+Simply configure your desired notification agents in **Settings -> Notifications** in the Seerr web UI.
+
+Users can customize their notification preferences in their own user notification settings.
+
+## Requesting New Notification Agents
+
+If we do not currently support your preferred notification agent, feel free to [submit a feature request on GitHub](https://github.com/fallenbagel/jellyseerr/issues). However, please be sure to search first and confirm that there is not already an existing request for the agent!