docs: add local deployment and upgrade guides

README.md

@@ -57,6 +57,11 @@ Any missing converter? Open an issue or pull request!
 > [!WARNING]
 > If you can't login, make sure you are accessing the service over localhost or https otherwise set HTTP_ALLOWED=true
 
+For repository-specific local usage and upgrade workflow, see:
+
+- [`docs/local-deploy.md`](docs/local-deploy.md)
+- [`UPGRADE.md`](UPGRADE.md)
+
 ```yml
 # docker-compose.yml
 services:
@@ -79,8 +84,6 @@ or
 docker run -p 3000:3000 -v ./data:/app/data ghcr.io/c4illin/convertx
 ```
 
-Then visit `http://localhost:3000` in your browser and create your account. Don't leave it unconfigured and open, as anyone can register the first account.
-
 If you get unable to open database file run `chown -R $USER:$USER path` on the path you choose.
 
 ### Environment variables