docs: add dashboard preview to README

README.id-ID.md

@@ -17,6 +17,10 @@
 
 Doktainer adalah platform manajemen Docker open-source dan self-hosted yang membantu Anda mengelola server, aplikasi, container, domain, SSL, backup, dan deployment dari satu antarmuka web. Dirancang untuk individu dan tim yang menginginkan kendali penuh atas infrastruktur mereka tanpa vendor lock-in.
 
+<p align="center">
+  <img src="./images/previews/doktainer-dashboard.png" alt="Pratinjau dashboard Doktainer" width="100%"/>
+</p>
+
 ---
 
 ## ✨ Fitur

README.md

@@ -17,6 +17,10 @@
 
 Doktainer is an open-source, self-hosted Docker management platform that helps you manage servers, applications, containers, domains, SSL, backups, and deployments from a single web interface. Designed for individuals and teams who want full control over their infrastructure without vendor lock-in.
 
+<p align="center">
+  <img src="./images/previews/doktainer-dashboard.png" alt="Doktainer dashboard preview" width="100%"/>
+</p>
+
 ---
 
 ## ✨ Features