docs: better Mercure hub schema

docs/cn/mercure.md

@@ -5,7 +5,7 @@ Mercure 允许将事件实时推送到所有连接的设备：它们将立即收
 
 无需 JS 库或 SDK！
 
-![Mercure](https://mercure.rocks/static/main.png)
+![Mercure](../mercure-hub.png)
 
 要启用 Mercure Hub，请按照 [Mercure 网站](https://mercure.rocks/docs/hub/config) 中的说明更新 `Caddyfile`。
 

docs/fr/mercure.md

@@ -5,7 +5,7 @@ Mercure permet de pousser des événements en temps réel vers tous les appareil
 
 Aucune bibliothèque JS ou SDK requis !
 
-![Mercure](https://mercure.rocks/static/main.png)
+![Mercure](../mercure-hub.png)
 
 Pour activer le hub Mercure, mettez à jour le `Caddyfile` comme décrit [sur le site de Mercure](https://mercure.rocks/docs/hub/config).
 

docs/mercure.md

@@ -5,7 +5,7 @@ Mercure allows to push events in real-time to all the connected devices: they wi
 
 No JS library or SDK required!
 
-![Mercure](https://mercure.rocks/static/main.png)
+![Mercure](mercure-hub.png)
 
 To enable the Mercure hub, update the `Caddyfile` as described [on Mercure's site](https://mercure.rocks/docs/hub/config).
 

docs/tr/mercure.md

@@ -5,7 +5,7 @@ Mercure, olayları tüm bağlı cihazlara gerçek zamanlı olarak göndermeye ol
 
 JS kütüphanesi veya SDK gerekmez!
 
-![Mercure](https://mercure.rocks/static/main.png)
+![Mercure](../mercure-hub.png)
 
 Mercure hub'ını etkinleştirmek için [Mercure'ün sitesinde](https://mercure.rocks/docs/hub/config) açıklandığı gibi `Caddyfile`'ı güncelleyin.