README: drop LLM/chat references

Revert "utils.sh: listen on IPv4 and IPv6 by default"

utils.sh: ensure cache directory exists

Dockerfile: drop --ipc=host

Dockerfile: install ffmpeg build dependencies

Dockerfile: order apt package alphabetically

Dockerfile: install pkg-congig

CI: replace flake8 check with black

treewide: format Python code with black

Update xtts to latest

Update coqui to latest

Update nginx to latest

Update all deps

Revert "WIP: Initial CUDA 12 support"

Revert "Massive CPU performance improvement."