This is the one I use to host on a vps. No clue on it’s deployability on a pi.
https://github.com/ubergeek77/Lemmy-Easy-Deploy
It’s auto installs and updates. Just need to forward the DNS for your instance to whatever domain name you like. It’s pretty straight forward from the documentation.
I mean, I can get most of any books I’m looking for from https://annas-archive.org/, and with the website is pretty clean from clutter.