Switch deployment to TrueNAS Custom App Wizard

Removes docker-compose.example.yml and docs/local.md; rewrites
docs/truenas.md around the Custom App Wizard flow (image push to
Gitea registry, env vars entered in UI, network attachment). Custom
catalog approach is not available in Electric Eel 24.10+.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -26,10 +26,10 @@ JSON, and let a custom profile template render the squares client-side.
                      [this service] → SELECT FROM action WHERE act_user_id=? → JSON
 ```
 
-## Docs
+## Setup
 
-- [Local setup](docs/local.md)
-- [TrueNAS SCALE setup](docs/truenas.md)
+See [docs/truenas.md](docs/truenas.md) for the full TrueNAS SCALE setup guide
+(Custom App Wizard + Gitea template override).
 
 ## Op type reference