ipx runs in an Arcane project of its own; docker-compose.yml is a sample (#208)

Production moved from the content project, beside audiobookshelf, immich and
Plex, to a project called ipx, where the frontend and directory of the split
(#207) will join it. The move changed ipx's network, and sign-in through the
tunnel trusts that network's gateway: the new compose file pins the subnet to
192.168.64.0/20 so the gateway stays 192.168.64.1 if the network is remade,
and config.toml's trusted_proxies names it instead of 192.168.16.1. Checked
by sending a forged Access token from a Docker bridge: it reached the token
check and was refused, which only a trusted peer does.

The repo's compose file was a copy of production's that nobody else could
run. It is now a sample: ipx alone, SQLite, folders beside the file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Add a feed no longer asks for a folder; a feed's folder is its title (#201).
+- `docker-compose.yml` is a sample to start from, ipx alone on SQLite with its folders beside the file, instead of a copy of the author's server (#208).
 
 ## [0.12.0] - 2026-10-11