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/extending-seerr/_category_.json

@@ -0,0 +1,9 @@
+{
+  "label": "Extending Seerr",
+  "position": 3,
+  "link": {
+    "type": "generated-index",
+    "title": "Extending Seerr",
+    "description": "Extend Seerr to your liking"
+  }
+}