Change Docker Compose Image

[TheDreadPirate]

The live TV transcode cleanup issue is legit an issue with Jellyfin itself, not with linuxserver's image. So switching from linuxserver to the official image won't resolve that.

For the record, I use the official image for my test instances (direct apt install for my production instance).

I am 99.9% certain that migration tool will not work with Jellyfin as it stands today. Too many API changes in the last 3 years.