chore: bump nginx and cms to v0.1.1 (#1)

## Summary

- nginx `v0.1.0` → `v0.1.1`: bakes default white-label routing config, fixes `/admin` 404
- cms `v0.1.0` → `v0.1.1`: white-label email templates driven by `SHOP_*` env vars

## Smoke test (run on server after merge)

```sh
docker compose pull nginx cms
docker compose up -d
curl -sS -o /dev/null -w "%{http_code}" http://localhost:8080/admin
# expect 200 or 302 (not 404)
```

Reviewed-on: #1
Co-authored-by: Michael Czechowski <mail@dailysh.it>
Co-committed-by: Michael Czechowski <mail@dailysh.it>

compose.yaml

@@ -11,8 +11,9 @@ name: libreshop-demo
 #   docker compose up -d
 #   open http://localhost:8080
 #
-# Component versions are pinned to v0.1.0 so the demo is reproducible
-# across hosts and survives rolling :main churn.
+# Component versions are pinned to specific releases so the demo is
+# reproducible across hosts and survives rolling :main churn.
+# nginx: v0.1.1, cms: v0.1.1, pdf/mail/shop: v0.1.0
 
 services:
 
@@ -47,7 +48,7 @@ services:
       "
 
   cms:
-    image: git.librete.ch/libreshop/cms:${LIBRESHOP_CMS_TAG:-v0.1.0}
+    image: git.librete.ch/libreshop/cms:${LIBRESHOP_CMS_TAG:-v0.1.1}
     pull_policy: missing
     restart: unless-stopped
     environment:
@@ -148,7 +149,7 @@ services:
       start_period: 30s
 
   nginx:
-    image: git.librete.ch/libreshop/nginx:${LIBRESHOP_NGINX_TAG:-v0.1.0}
+    image: git.librete.ch/libreshop/nginx:${LIBRESHOP_NGINX_TAG:-v0.1.1}
     pull_policy: missing
     restart: unless-stopped
     ports: