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/discord.md

@@ -0,0 +1,31 @@
+---
+title: Discord
+description: Configure Discord notifications.
+sidebar_position: 3
+---
+
+# Discord
+
+The Discord notification agent enables you to post notifications to a channel in a server you manage.
+
+:::info
+Users can optionally opt-in to being mentioned in Discord notifications by configuring their [Discord user ID](https://support.discord.com/hc/en-us/articles/206346498-Where-can-I-find-my-User-Server-Message-ID-) in their user settings.
+:::
+
+## Configuration
+
+### Webhook URL
+
+You can find the webhook URL in the Discord application, at **Server Settings → Integrations → Webhooks**.
+
+### Notification Role ID (optional)
+
+If a role ID is specified, it will be included in the webhook message. See [Discord role ID](https://support.discord.com/hc/en-us/articles/206346498-Where-can-I-find-my-User-Server-Message-ID).
+
+### Bot Username (optional)
+
+If you would like to override the name you configured for your bot in Discord, you may set this value to whatever you like!
+
+### Bot Avatar URL (optional)
+
+Similar to the bot username, you can override the avatar for your bot.