Support for Calibre

[Luctia]

Discussed in #38

^{Originally posted by M-Davies November 7, 2023}
https://hub.docker.com/r/linuxserver/calibre-web
https://hub.docker.com/r/linuxserver/calibre

Seeing as this stack seems to be missing a dedicated Ebook reader (minus audiobookshelf but that's more of a audiobook/podcast soloution), having one would be really useful in cominbation with readarr

[M-Davies]

Still getting to grips with Calibre at the moment but when I've got it nailed down I'll look into pushing something