Cache: Reduce browser cache to 8 hours

Szenario: Users open the page at 22:00 and need fresh data at 6:00 on the next day.

configs/nginx.conf

@@ -67,7 +67,7 @@ http {
             add_header              X-Cache-Status $upstream_cache_status;
 
             # Browser cache
-            expires 18h;
+            expires 8h;
             add_header Cache-Control "public, no-transform";
         }