Improve README screenshot layout

README.md

@@ -6,13 +6,8 @@ The project is built for people who want the feel of a polished health app witho
 
 ## Screenshots
 
-<p align="center">  <img src="docs/screenshots/healthspan-orb.png" alt="VYTA Healthspan orb" width="260" />
-  <img src="docs/screenshots/activity-detail.png" alt="VYTA Garmin activity detail" width="260" />
-</p>
-
 <p align="center">
-  <img src="docs/screenshots/healthspan-factors.png" alt="VYTA Healthspan factor breakdown" width="360" />
-  <img src="docs/screenshots/healthspan-recommendations.png" alt="VYTA Healthspan recommendations" width="360" />
+  <img src="docs/screenshots/showcase.png" alt="VYTA app screenshots" width="720" />
 </p>
 
 ## What It Does