Add demo section to README

Added demo section with screenshots for desktop and mobile.

Author: officialrajdeepsingh

README.md

@@ -2,11 +2,18 @@
 
 A stylish, modern, and content-focused theme for Ghost. Logly is designed to be easy to use and customize, providing a great reading experience for your audience.
 
-## Demo
-
+<details>
+    
+<summary>  Demo </summary>
+    
 ![Desktop](./assets/screenshot-desktop.png)
+
 ![Mobile](./assets/screenshot-mobile.png)
 
+</details>
+
+
+
 ## Installation Guide
 
 Installing the Logly theme on your Ghost blog is a straightforward process. Follow these simple steps: