* Add Jellyfin media server type
* Add and use `forms_dict` and `long_types` methods
* Add `JellyfinMediaServerForm`
* Use `JellyfinMediaServer`
* Add and use `MediaServerType.handlers_dict` method
* Do not hard-code `plex`
* Also map backwards in `MediaServerType.long_types`
* Use the long server type for URLs
* Loop over media server type names
* Add `MediaServerType.long_type` property
* Add `media_server_types` to template context
* Use the `MediaServerType.members_list` class method
* Port is already part of the URL