docs: 📝 lower image size to reduce readme size

README.md

@@ -40,20 +40,13 @@ You need to have [GPodderSync](https://apps.nextcloud.com/apps/gpoddersync) inst
 
 ## Screenshots
 
-### Homepage
-![homepage](./screens/index.png)
-
-### Discover
-![homepage](./screens/discover.png)
-
-### Search
-![search](./screens/search.png)
-
-### Episode list
-![episodes](./screens/episodes.png)
-
-### Episode description
-![modal](./screens/modal.png)
+<center>
+<img src="./screens/index.png" height="300" title="Homepage" />
+<img src="./screens/discover.png" height="300" title="Discover" />
+<img src="./screens/search.png" height="300" title="Search" />
+<img src="./screens/episodes.png" height="300" title="Episode list" />
+<img src="./screens/modal.png" height="300" title="Episode description" />
+</center>
 
 ## Clients supporting sync of GPodderSync